Ooooh, I have plenty! Years of modding have resulted in soooo many excellent choices, my personal favorites are: JK's Skyrim - https://www.nexusmods.com/skyrimspecialedition/mods/6289 Gives so much more life and detail to all the cities.

Northern Roads - https://www.nexusmods.com/skyrimspecialedition/mods/77530 A somewhat newer mod that really caught my eye. An overhaul of ALL of the main roads in Skyrim, changing the road material and adding props and details all around.

Sekiro Combat S - https://www.nexusmods.com/skyrimspecialedition/mods/79206 This mod adds a Sekiro-styled parry effect to melee blocking. A lightweight mod that can be added on it's own to add some flavor to Skyrim's somewhat bland melee combat.

Signature Equipment - https://www.nexusmods.com/skyrimspecialedition/mods/16190 Weapons and armor slowly get better the more they're used in combat. A simple one, but I end up getting attached to my gear, so something like this just gives more tales to tell!

High Level Enemies Redux - https://www.nexusmods.com/skyrimspecialedition/mods/32801 Adds tons of new enemy variants and scaling enemies. I love seeking out strong enemies and skyrim's difficulty kind of tanks after a certain point. This mod fixes that! Plus, this mod in tandem with the Sekiro Combat mod gives a real reason to learn to parry!