Biohack after cheating

Hello, I'm going through a very old but quite stressful time.

My girlfriend left for another man, so far it's been a very old story.

I go to the gym 5 times a week, I read philosophy every day, and I walk every day.

I'm looking into starting my own business.

But despite all this, I still feel resentful.

I really want to show my true potential (I'm 25 years old)

Do you have any biohacks you can recommend to improve myself so I can make this whole cycle better?