3 things in my opinion keep me coming back day after day, year after year.
1 Challenge, perhaps its time to master a different aircraft or style of fighting?
Or a totally different side of gameplay? Or perhaps switch from pure furball mode to more of a tactical game.
There is a lot to learn, always new experiences to seek out.
2 The company that you keep. I'll admit, I've been very very lucky. I have been flying with some of the same guys since 1996, and they keep me coming back. Meantime there are new guys constantly joining, new faces to put behind the names. When my computer died back at Thanksgiving time, I couldn't replace it, just did not have the money. My squad mates put together a paypal acct, and chipped into it, how many, I don't know. But it had to have been quite a few, because it was enough to build a new system from scratch. How can I ever repay that? Well for starters, by being here, being ready to help anyone of those guys at the drop of a hat. Our squadron motto has come to be "A place where strangers become friends, and friends become brothers". I have 2 real brothers and a sister, and none of them have ever really understood me. Everyone of my squad mates knows the real me better than my family. Take the time to find a squadron that truly fits, and remember, you get out of it in direct proportion to what you put into it.
3 Giving back to the game and the community. Different people do this in many many different ways.
Start by just being a good member of the community. Watch what you say, and who you say it too, and how you say it. Then gently nudge others in the same direction. Give everyone you meet a little respect and courtesy, someday it will all come back to you. Find something to immerse yourself in that helps the community.
CM crew is I believe always looking for good SOLID community members who are looking to give something back. Skins and terrains are another prime spot. Just a matter of time, learning the required skills and doing the work. There are ways I'm sure have not been thought of or invented yet. So, take a look, what can you find that fits what you have to give?