If you like playing solo and PVE, then I would recommend trying some of the lore-oriented sides of the game. Especially if you decided to play ESO because of a specific playstyle.
- rogue/assassin: In that case I would recommend you checking out the "Dark Brotherhood" and/or "Thieves Guild" DLCs.
- support/healer: run dungeons as a healer or support other players in public dungeons or at world bosses.
- crafter/housing: start collection blueprint for furniture and start decorating your houses.
- social roleplaying: look at the "guild finder" for some guilds that are absolutely dedicated to roleplay. can make huge fun sometimes.
there are many more ways to play the game, just try around and dont hesitate to ask people :)