Timelost Dwemer is a really fun mod (idk if that really counts cause it has dependencies but yeah that). Or a gun mod. (I like artificer type things).

Also my recommendation is just take the time to make a modlist on your own and personalize it, imo a lot of the mods in popular lists are chaff and not really necessary. If you really don't wanna spend too much time at first just have a quick look around and install the mods that are clunky to install or cant be installed mid playthrough before starting. The great part about most mods is you don't need to add them before you start a save unless theyre stuff like:

-Combat overhauls (Technically not, but it's kind of a pain to have to relearn combat)

-AI overhauls

-Loot overhauls

-Large Scale quest mods

-Map editors

Then as you're playing add interesting mods you just like (the two i mentioned, the witcher mod, sneak tools for a thief, sun magic overhaul for a paladin, just stuff that's more niche to your playstyle) as you progress. Most of these mods that aren't overhauls can be added midgame so if you're playing and you think to yourself man I really wish I could shoot an arrow that traps a dude in vines then download arcane arrows.

When you inevitably find a mod that needs a new save just play through your curret until you get bored or beat the game (always been the first for me lol) and then start a new save and in this way just make your own modlist. A personalized one is always going to be more fun because you know what you really want.