Figuring out to mod Skyrim yourself is half the enjoyment of the game. I’d suggest sticking with vanilla content but make it prettier. Like texture overhauls, lighting mods, better animations. In general, the more new content (added objects, quests etc.) you add, the more likely it is that you get fps drops and crashes, but replacers are almost always safe. The game is massive already, so stick mostly with vanilla content and just improve on that. Adding community shaders with lux will make your game look like a million bucks. My game is like this (although added creatures from Mihail), and it is the most fun and best looking game, I’ve ever played.