Lots of advice - I'd get a friend/squad you can fly with, even if it's in another game. Lots of us are into DCS, IL2, WoT, WT, all the other options, in addition to AH3. What you're experiencing is something every gamer goes through in any game they play longer than a week or two IMO. Just take a bit of a break, keep your sub running, and just come back when you feel the itch to.
Another option is to set some goals - ie try different stuff than you normally do, say fly just the Spit5 or Ki43 for a couple weeks or a tour, and set a hard roof of 10k for yourself. Or conversely, fly just the K4 or P47M, or some other E monster, and only engage in mid/high alt fights, managing your E and focusing on that type of fighting. Try for a certain kills/hour rate, that sort of thing. I know many crap on the stats, but if you use them for just personal benefit and setting goals like this, it can be a fun way to push yourself, and give you a reason to log in every night.
Not sure if you've tried VR, but if you haven't, and are looking for a way for the game to blow you away again, that's something you certainly could try, and would enjoy IMO. The cost has come down IIRC quite a bit for the Rift as well.