You can't be successful long-term without working toward at least some of the basics.

1
Ensure Good Bankroll Management. Effective bankroll management is essential for long-term success. ...
2
Be Research-Driven. ...
3
Track Your Results. ...
4
Use Value Betting. ...
5
Shop Around for the Best Odds.
Firstly, it should be the amount you're willing to lose  never bet your last money. If you've chosen your strategy and determined the portion of the bankroll for each bet, stick to it. Even if a certain match seems to have a surefire result  don't bet more on it just because you feel so.