Any Tips On Restarting After A Breakup?

Short version of my little sob story, my (23m) ex (23f) who I dated for 8 years emotionally cheated on me with my best friend I’ve known for +15 years, then left me for him. I can only assume now they went straight into a relationship. It’s crap, and I have bad days still, and I miss her like hell but for the most part I’m alright. It’s been about 3ish months now and I’ve reconnected with a real buddy, picked up gunpla as a hobby, I journal, I’m writing my first short story, i work more, and I’m planning to hit the gym and actually stick with it.

I’m still doing all these things I listed but is there more I can do? I’m not really sure how to restart after something like this. It was my first relationship. It’s hard to really motivate myself right now, to change and be better for me. Emotionally I feel like I’ve healed a lot after three months, I’ve made peace and gave myself closure. I don’t even wanna get back my ex anymore and I’m sure of that, but I know I’m lacking something still. Like I don’t have a drive to go out and do something, it’s like a road block in my head.

Any tips on how I can better myself, to motivate and stay disciplined for me? I feel like I hit a brick wall in my healing process and I can’t move forward.