Roleplay
dive into lore
I hear dungeon diving is pretty popular in the TES series
A shameless self quote, I know, but it reflects points that I would be duplicating here. Even if the initial intent was to suggest direction for a new player...
From http://www.gamesas.com/topic/1466447-a-newbie-here/ thread...
It really depends ultimately on you. Someone mentioned getting the dragonborn dlc. You could do that or perhaps even get all the dlc. You could roleplay something you find interesting, you can do what you want.
What I'm doing as I just got back into it after a break is I finally upgraded to skse and sky ui so I'm using all sorts of mods I didn't use till now. I also rolled a char and opened the console and typed tmm 1. Gave myself all the map markers. This time around it's less about finishing quest lines for me than just popping into places and just taking them in and clearing them out. Some quests provide nice distraction but there is plenty to do just ignoring them.
As I said it depends on your play style and what you want from the game on this play through.
It also depends whether you are playing on pc or console as my ideas won't work on console. Find somethings you like about the game and focus on them for a while.
It's a game you shouldn't have to force yourself to play it. If you don't enjoy it that's up to you.