Initially to consolidate a 1600+ rating, hopefully reaching 1700. Also to improve my understanding of openings and the "early middlegame". At the moment I feel like I'm pretty good at finding the correct move on those tactics websites, I just need to work on being able to engineer situations where I can use that tactical play. Finally, when I lose games, to try and find the move(s) I made that caused me to lose and decide what I should have done.