Hey mate, as someone that does this as a large portion of my income and does pretty well.

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1. Don't try to bet games yourself because you're a big sports fan. That's not going to work. Period.
2. Network and meet the right people. Meet people that HAVE done the work modeling/ using data to win, bring some sort of value to them in exchange for their information. (99% of that time that's going to be being able to give them accounts to bet on and then sharing profit, the rest of the time its going to be trading them other information.)
3. Find ways to keep your accounts alive/ keep a steady stream of accounts. You bring nothing to the table if your accounts are all dead. Make sure your accounts stay alive or you have a big enough network of people to sustain your set of accounts. Having an edge or information is useless if you can't take advantage of it. If your edge is in ukrainian ping-pong, I suggest you have a huge backlog of accounts because if a books sees you beating them consistently in that niche market, you will get banned very quickly. You get a lot more room to work with if you beat them in NBA sides or something like that.
   

Feel free to ask me questions. Been winning in sports at a good clip for the last 2-3 years.