Good way to improve my game

If you do this, you will blunder less pieces but you will inevitably need more time to think, so playing 15|10 games would probably benefit you a lot more. You can improve by playing blitz, but it'll be a lot slower. I'd just play a few games every now and then for fun and keep it that way. Good luck!

Blitz approached the wrong way is the same drinking black coffee without cream and smoking cigarettes one after the other all day long just don't your better off playing 25.0, 35.0, 45.5. 60.0 rated games in controlled conditions or in a league with strict rules to get in one I think you have to play around 21-30 rated classical games and have a spotless record no bans or stars next to your name.
Studying and hard work is a must if you want to make rapid progress and become a solid player.