So just keep grinding

If it's your first character continue questing. You'll come up against weaker opponents so it's not savage yet you'll fight some challenging bosses at the same time. This let's you get used to your character and how to play it, as well as trying different armour sets and abilities.

You'll get plenty of skill points so you won't have to respec when you want to try something different either.

Once you're around 160-200cp you can start to get "end game gear" i.e. Max level set gear that works for your play style and character while optimising it's potential, whether you want to heal, tank, damage deal or just continue solo'ing.

Read up on guides by popular players like @Alcast @FENGRUSH etc and join a few guilds where it's easier to join in on group activities.

Watch outs for me would be:

Don't use group finder until you've done some dungeons with friendlies
Don't go into pvp alone until you've got some experience with at least a small group
Don't grind your first character unless you're seriously bored of questing

I say the above because they can be sure fire ways to make the game frustrating, upsetting and above all else boring.

Remember this is a game, if you don't enjoy it you're wasting your time.

Hope that helps

Congrats on Level 50! Things get really interesting from here.

PvP's not too bad at this level. My advice for now is to pick a campaign where champion points are disabled so the fight is a little more balanced -- Azura's Star if you're on the NA server. A lot of major groups I've come across are happy to teach new players the basics, and there's also a nice tutorial in the beginning. Just stick with a group, don't rush into a siege alone, and try and keep an eye on your surroundings. If you're not in a group, or prefer not to join for any reason, just use your map to see where the action is and follow after them. Many people will still help or revive you if you're near, but the downside is you can't call for help in /group chat if you die. As for dying, don't worry too much. Everyone dies. A lot.

If this is your first time in Cyrodiil, consider going into all the delves there and picking up skyshards. If I remember right, there are 15 skillpoints worth of skyshards in Cyrodiil alone. Four of them will be behind the gates of other factions, so just visit PvP regularly, check your map to see what the status on the gates is, and sneak in if they're ever open. There are more in the Imperial Sewers and City if you have the DLC.

Outside of dungeons and PvP, you'll want to keep exploring Tamriel. There are still tons of skyshards to gather and quests to do, and those quests will help you reach CP 160 faster so you can get your hands on the best level of gear.

Good luck!