A lot of this has already been covered, but, been there, done that.
My youngest was born when I was about your age, and it was about that time that I decided I don't have time for mmos anymore. I still play video games from time to time, but it's mostly winter and when it's 9:30 and I've got a half an hour to myself.
You need hobbies, something to look forward to and something to get your mind working on. The first thing I did was taught myself to play guitar. No, I'm not joining a band, and you won't see me on YouTube anytime soon, but it's something that I can do by myself, put a little bit of effort into, and get great joy out of. I grew up listening to Slayer and having the ability to play thru about 80% of the Slayer catalog whenever I feel like it is awesome (fuck you, Angel of Death). By the time my daughter went to school, my ex was asking me if I had music playing or if it was me playing. That is supremely satisfying, and still to this day, I will just take a weekend and learn whatever has been stuck in my head for the last month.
Then I got divorced, and I realized I needed more shit to do because I had way more time to myself. The first thing I did was get my gaming group together. Now, Saturday night is Gloomhaven night and has been for a couple years. The guys come over, we fire up the grill or the smoker and we play board games for 8-12 hours. My GF fucking hates it, but I don't give a shit. I've got a 2500sq ft house, I spend 6 days a week with you, go fuck off, I'm playing games. If I was still married, I'd do the same, I would just make sure there was a kid watching rotation so my wife could do something similar and it would be "equal." My kids are at the age now where I don't have to be concerned with that because they have lives of their own, but you will have to be.
After the bullshit of the last couple of years, I got back into guns, like has been suggested. I joined a 250 member private gun range and I've hit every monthly meeting since. Why? Because you've gotta meet people. Even though it's the same 30-40 of us every month bitching about how the sign-in shed needs to be replaced and the mice are fucking up the gate, I still meet people and get to learn new shit from guys who have more experience and come from all walks of life. It's awesome, can't imagine not being a member anymore.
The latest thing I'm doing is woodworking. Just like guns, I grew up doing this stuff and it just kinda fell away. Life has a way of doing that when you pair up with someone. You meet a woman, she becomes your wife, and she becomes your life. That life turns into a couple of extra lives running around and next thing you know you forgot what you liked to do. Getting divorced was the best thing that ever happened to me because I forgot who the fuck I was and what I liked to do. Now, I'm not saying you need to get divorced, but you do need to figure out who you are and what you like to do so you've got some passion in life. Don't give me this work shit, either. No one is ever gonna remember you for what you did at work. But your kids are gonna remember when you all bought bowling balls and shoes and joined that league, or that coffee table you built in the garage out of that tree that fell over in the back yard.
Gotta spend some time finding yourself again. It's easy to get lost in the hustle of a monogamous relationship who are running a household and a couple of Rugrats running around. It's easy to forget that you used to do things with other people and you had things you did alone. Go find that stuff and those people and do it again. You don't need 168 hours a week to be married and work.