Looking to create some passive income through blood, sweat and tears :)

Hello everyone. I am a 25 y/o male and I work as an investor/online poker player/sports bettor. As the variance in these professions is extremely high, I would like to be able to have a safety net of sorts to make me feel more comfortable when not having a good month in my job. I have my risk spread and have very good bankroll management but still there is a non 0% chance of risk of ruin and going broke.

What would you recommend for someone like me to do to create passive income?

Skills include: Working in high pressure situations while being able to think rationally, good with probability, I consider my social skills to be good also :)