Only play games with a time increment. Five seconds is pretty good. In my opinion, it was a bit of lack of sportmanship. Well, I'm not sure about that, because you have to be competitive too. No one is obliged to say, "hey, this is your game, win it", just because he/she loses a piece (even a queen). You have to have a mindset to fight until the end and keep playing good chess even in inferior positions.
I know you are a serious player and want to improve. Play slower games and take time to think. If you play only blitz, it is very hard to improve. A good time control would be 15 min + 5, but any time control with a good increment would be nice. It is totally possible to get better here. I started playing here two years ago, I was around 1600, now I am 1900 and I want to grow even more. You just get better with time, study and experience.
I know you are a serious player and want to improve. Play slower games and take time to think. If you play only blitz, it is very hard to improve. A good time control would be 15 min + 5, but any time control with a good increment would be nice. It is totally possible to get better here. I started playing here two years ago, I was around 1600, now I am 1900 and I want to grow even more. You just get better with time, study and experience.