Nope, this isn't one of those treads were I'm going to ask you all at what level you play

It is rather about how you judge your own level.
I know a lot of us, including me, have stated that we have gained a level every now and then. Now, if we first agree what a level is, which according to me is, players who can beat each other, even if it turns out to be 2 vs 8 wins, are of the same level, while a player you never win against is at least a level above and a player you never lose to is at least a level below. If we agree to this, then I doubt that we have actually gained so many levels as we might have stated, I know I haven't.
This brought to me the interesting question, what is it in our game that makes us feel like we have gained a level, or even become any better? Is it a new weapon? Higher consistency? Better serve? Or something else?
Looking in to my own game, I have realised that when my offensive game develops, I feel like I'm stepping up my game a level, but I rarely feel the same when my defensive game improves and I don't know why?!?
Also, when I feel that I'm playing good, I often get the feeling that I have stepped up in level, even if my results tells me that I haven't since they can be virtually the same as before.
Lately (this season) I haven't felt that I've played great, my offensive game haven't felt any sharper then usual, but despite this, I'm currently undefeated since changing to Bry... Sorry, undefeated since the start of this season, which indicates that something about my game have actually brought me up a level but I'm not able to pinpoint what it is.
So, for those who don't enter rated events (where you will get a receipt of your level) what is it that you judge your level on?