You can’t do stealth and solo most content in the game simultaneously; older enemies will be confused as to where you went if you go invisible but iirc newer ones will just see you anyways. Mechanically, stealth only really matters in PvP and while doing thieving/murdering. THAT SAID, I’m hoping that nightblade rework will make better use of going invisible to proc buffs and passives in PvE. My suggestion would ofc be to go nightblade.

Pick up grim focus (merciless resolve is better but the other one might be more fun if you’re bad at weaving).

Impale would be good to have too, it’s ranged and a very strong execute ability. I know it’s magicka but you don’t have to spam it for all that long, I use it on my stam bow/bow for overland and it’s fine.

Of course, you’ll want shadowy disguise. Weave it in before big hitting direct damage abilities (like grim focus and some ultimates) for guaranteed critical strikes.

Shadowy disguise will also proc a vampirism passive for even more damage! (You only need to be stage 1, don’t do higher than stage 1, you’d be nerfing yourself for no reason.)

Twisting path and dark shade are nightblade abilities you’ll want for damage. Shadow image instead of dark shade might help with soloing some things.

From there, you can choose to pick up a different class for a third line or stay pure nightblade. I’ve been enjoying dark magic on my sorc with crystal fragments, only using the ability when the instant-cast version of it pops up. The way my build works is that I use my bow and do my rotation and then I get to do fun bursts where I hit an enemy with: a light attack, snipe, light attack, grim focus, light attack, crystal fragments, light attack, grim focus. Feels like I’m making them explode before they even know what hit them. Bonus points that you can make it red to match nightblade (if you have the skill style).

Daedric summoning also has a skill like grim focus but its summoning 4 daggers.

I like streak for overlanding but unfortunately that’s not in either of those lines… you can get something similar from vampire, though. And I think that skill (mist form) also procs the “coming out of invisibility” passives.

If you’re talking soloing dungeons too, you’ll need undo on one bar for some mechanics. It’s from psijic.

Talking bows, I’d do focused aim as your spammable. It’s very easy to weave with, I think I figured out how to weave with it before I knew weaving existed. If you’re doing bow/bow, you’ll want arrow barrage on your backbar with maelstrom infused bow enchanted with beserker (weapon/spell damage). This will proc the backbar enchant even if you’re on your frontbar.

For fun, you can use vault (scribed bow skill), there’s some scripts there that may be beneficial for buffing your bow damage.

Personally, I use vateshran bow on my frontbar with ansuul and macabre vintage. I’m not sure how good it is in the grand scheme of things but I find the build fun.

Hope this gave you some inspiration!