How can I say that you are a pro gambler? You are stating by yourself on this:
For a couple of years, I had a lot of success betting on football from very obscure leagues. I had an algorithm which was great at spotting games where bookmakers had not priced up correctly.
What? I don't see any thing on that quote which supports your statement. OP mentioned that he became successful on sports betting and not on poker. Nah, nevermind.
Maybe he was trying to say that the op is not a pro gambler because he is depending on his algorithms or methods/strategies . pro gamblers are already aware that there are no working strategies because gambling only based on luck . if they lucky they win and they save thier winnings , they use their winnings on other profitable and less riskier activities but they play still gambling on other times .