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Harder Better Pillar Puzzles - with this mod, in most of the pillar puzzles every activation will rotate a certain set of pillars, rather than a single pillar; makes puzzles slightly more difficult. The plugin is in form 43 version (Skyrim Classic), should work on Skyrim SE all the same.
Faces of Time - adds a speedbump in Skyrim Main Quest: after Alduin's Bane scene the quest is stalled until you gather a number of Dragon Priest Masks. The number is configurable between 0 and 6, dragon priest masks added by DLCs do not count towards this. Recommended to use with another mod that guides the player to locations of those masks