I know people who lived off sports betting through the competitive Magic: the Gathering community. These people are off the charts brilliant and they struggled to eke out a living. Then they went and did literally anything else and were happier and making much, much more money. As regards to your question, you have to be hungry for it.
You have to be determined. This is your hard earned money, man. Why should it get lost. Be confident and trust in something. Analysis ,skills ,God.etc. Man, if it seems that you are never gonna exert confidence, then look for a way to quit because without confidence, you would always lose. You have to always want to win. That's how winning starts. There are people out there who gamble for fun. Maybe ,that's how casino make money. They get money from less experience or less lucky people. 1000 people betting 50 dollars in a day can give a casino 50k. If they pay out 20k as winnings, then profits starts at 30k. And am sure that its more than that. They make incredible amount of money. So don't fret that the casino can go broke. No , they never do. That's why there are always new casinos every 4 months.
But How much money do you want to make? As a professional gambler, I'll tell you that anything less than 5k/month is going to be far worse than just about any job you can get. But let's say you REALLY hate working for the man. So you'll need to make 4k/month. That will allow you to pay your taxes (including all of the extra self-employment taxes), and have a small condo or apartment and pay your bills. I'm assuming you don't care about thinks like "savings" or "retirement". One thing you need to know is that you have to choose a good casino. Mine is
Vegas casinoHow many bets can you make per day? Well the answer has got to be "not many". Keep in mind that these bets have to have an average expected win% of 55% which is god-tier. Also we have no idea what sports you've built a model for/study. But let's say you've built a magic model for a ton of sports and can find, on average, 3 +ev bets per day.So you can make 90 bets per month.49.5 wins.40.5 losses.Let's assume you do a ton of line shopping and can get, on average, -107 odds..So the 49.5 wins will return 46.035 units. Minus the 40.5 units you lost on losing bets means you've profited 5.535 units a month. You want to make 4k every month, so that means your unit needs to be $722.67.
Now the aggressive BRM says to have 100 bets in your bankroll. That's $72,267. That's obviously the bare minimum but since you hit at a god-tier winrate in all sports, that's probably safe.So, to sum up. You need to start with a bankroll of a little over 70k. That's money you never touch. You need to win at a win rate that essentially nobody in the world can win at, at lines that very few people can get, and make more bets than most professionals make. And if you can do all of that, you will make a grand total of 4k every month. That's a good strategy. You can modify the strategy as you see it fit and use it