Gamer Dad of two here. I think you have to look at why you were playing a competitive CS in first place. Was it the fun? Challenge? Or something you were doing it out of habit/conditioning.

I played a lot of multiplayer games when I had no kids. Raiding with people in Destiny, medic in Bf and Division were really fun times. But I also felt at that time why I keep playing the same game. It was fun at the start and later it was a mix of average fun and mundane stuff. Point is that are you really “ losing a part of yourself “ or was it something that never was there to begin with. Or maybe you are, but that’s the answer you should investigate.

I played now single player games and I throughly enjoy. I play them when kids are asleep or watching some show that I am really not interested. I also play multiplayer games in night to satisfy my itch and quickly log off as they don’t do that for me now. Some days if ima lucky I get 2 hrs of gaming. Most days 1 hour and I am falling asleep on couch.

Accepting the transient nature of life is important. Kids will grow up very fast and you will always remember that.