Hi OP I am ranked 3k and I will tell you what you need to do to get better:
Play count:
You have on average <400 plays a month.
Don't expect consistent improvement until you bump it higher.
Even if you don't retry maps, <400 is too low. You want at least around ~1000.
Also. evenly distribute your plays throughout the week. Don't play like crazy for one week and take a break for the rest of the month.
^Everything else is minor compared to this problem. Jumps, streams, squares, patterns, AR, mods, don't even bother with specific training.
At your level, there is nothing to coach or teach about, you need to get better at everything before you can hit insanes=PLAY MORE OF EVERYTHING.
Refer to this for any other questions ==>
http://osu.ppy.sh/forum/t/99612