I'm level 47 and I've only completed a handful of story quests. I'm doing Cauldrons and Vantage Points now. Pretty much taking care of all the collectibles before I get into the main story. That's basically how I do all open world games that allow it.
PC GAMING: BEST GAMES. WORST CONTROLS
A mouse & keyboard are made for sending email and typing internet badassery. Not for playing video games!!!