I work on my set collection while listening to good music in the evening to relax.

If you want something to farm every day you might want to try endeavours. It's a new system which gives you a list of 'quests' to complete (shown in the Group menu) in return for Seals of Endeavour, a new currency which can be used to buy items from crown crates. You can complete up to 3 daily endeavours (from a total of 5) and 1 weekly (from a total of 3).

They're usually pretty simple and can be quite quick (for example one today is just to refine raw crafting materials) but can also be a prompt to try something you might not normally do. It's a pretty low commitment and it can be a starting point to get you going each day and then you can see what else you feel like doing after you've finished.

The downside is because it was added only to comply with Microsoft's policy on loot boxes and ZOS (and Microsoft I suspect) still want buying crates to be preferable it takes a long time to get enough seals to buy anything other than the junk consumables, and then you have to wait for the items you want to be available. But on the plus side you're guarenteed to get the item/s you choose instead of having to gamble for them.

If you want something more extensive my suggestion is to find a guild you like with a regular schedule of events. That's likely to be more varied and fun than attaching yourself to one area of the game you can farm over and over.

Okay ... serious answer. The absolute feeling of freedom. I feel like I am traveling and living in a different world. Also combat without cooldowns is fun

Writs and seals most days.

Experimenting with different race/class/skill/gear combos

ESO is greatly underrated and could do better than other more popular mmos.What i love in this game is the music,the environments and the immersion.I like almost every aspect of the game except for furnishing(but i am not against it) which i didn't bother 1 time since homestead.My house was snugpod with like 6 storage chests xD.Progression/dailies and having stuff to do brings me back along with my favorite of all which is dungeon achievement runs.

If you need something to do, then buy a piece of land and build a house, farming the resources for it will not let you get bored...

Personally, there are a number of things I could mention. Like being able to spend time in a beautiful world without worries (of course without forgetting the worries of the people of Tamriel, such as hordes of Daedra, Harrowstorms and other inconveniences), let this world and the music soothe me, distract me and not to think of anything bad. And last but not least, to meet my loved one.

The internet.

Running out my enlightenment, collecting the daily log in reward, doing Endeavours, paying my weekly dues in the 4 trade guilds I am in, selling stuff in the 4 trade guilds I am in.

Occasionally run pledges on weekends if I have the time, rarely bother during the week though.

Lately I limit myself to about an hour a day running out a 100% xp potion, turn on my playlist Itunes do a mix of farming mats/killing stuff, instead of doing daily writs on all 18 of my characters now I only do them on my main, probably 2 maybe 3 more years of that and I should hit the CP cap at some point, not in any rush.

Even doing a bit of multi tasking bought a little under desk exercise machine one of those mini steppers, that I am using during winter, can't be stuffed going for a jog in the cold.

Sell all the mats I gather over the course of a week the day after the trader flip, gives me plenty of funds for whatever I need.

Have tried on and off doing the quests again on alts just don't really find it that fun repeating them, always end up drifting back to my main instead.

Once the chapter drops I will focus on doing all the quests on my main, same again once the DLC drops later in the year, then I will switch back to what is above.

Other than that real life takes priority, got other things I want to do, see no reason to spend a large number of hours a day on ESO unless there is something I specifically want to do that day, at the end of the day ESO is just one of the thing I do to reduce my boredom in my spare time nothing more than that.

Cyrodiil when it works. AP made can become gold later for other things I like to do like housing. Also the AvAvA fights in Cyrodiil can be quite fun due to the randomness of it all.

doing the Daily Endeavors so I don't have to spend real money on shiny things from the scam crates. Ngl if endeavors wasn't a thing- I wouldn't touch this game aside from collecting event tickets.

I spend about half my time actively playing and half my time chatting with friends. Just collecting/farming feels grindy.

Sorry for the repeat those who know me: I come to ESO to take a breath. It's for me a side game to chill solo. I do only what I feel to do, without grinding and not bothering about achievements. I just take it easy and enjoy.
At the top of it, I'm part of the lucky players with no performance issues and the little I do of the content isn't affected by any big bugs and/or technical troubles.
So all in all, ESO is for me a nice place to relax when I need it, and that makes me return to it regularly.

A feeling of competence that I don't get in real life.

cyrodiil...despite the horrendous game performance at times, despite getting zerged down by a sea of enemies, despite getting owned 1 v 1 by people using similar builds (and worse yet, visually similar characters) - still a surprisingly relaxing way to spend/waste some time...

Boredom. Pvp is fun when it works. Other than that nothing.