Play against someone who's spent years in prison. I'm serious.
I've been playing chess since my dad taught me and my twin when we were 5 or 6. My dad has not been to prison, but to used to be very intellectual and his brain can figure out analytics very easily. So he had a fancy chess set. My sister and I would frequently play each other when we were young. My mom is good at chess too, and was surprised when I beat her in my early 20s. She's been playing chess for decades and played some chess in prison, but she was only in prison for less than a year so she's not an expert, just better than average.
Then when I was like 25, my sister had a drug dealer who had just finished a 10+ years prison sentence. I considered myself a pretty good player at that time. The drug dealer guy sat down and finished me within two minutes (that's what she said). Played him again, same thing. Again, same thing. I got tired of getting my ass kicked so I stopped playing him.
Then I downloaded the chess app and would breeze through until I leveled up so much that I was playing some really tough people. I'd ask my ex (boyfriend at the time) to look at the board on my screen and help me play. He's been in and out of prison since he was 18. He'd just tell me exactly what moves to make and I would beat EVERYONE I played on that app. And my ex wasn't some genius, he had above average intelligence in some areas, but when it came to chess, it was as if his mind was programmed into the board.
So that's my advice. People who've spent years in prison and played chess there have an extreme advantage over most of us law abiding folk.