Simply improve your analysis wherein you'd be practical in a way. If you're hesitating to your bet then atleast minimize the amount of money you would be engaging yourself into it. There's no assurance ofcourse, with the winning team or fighter in every sport. Gamblers can jist make speculations or guesses based on previous matches or fights but that won't guarantee things. You may also go bias with lower odds or simply go in line with majority. Also not be greedy of odds; many gamblers are betting to bigger odds because it will result to bigger rewards. Unfortunately, risk would be bigger as well.
Betting done with research and good analysis will certainly make an edge, but know that in gambling there’s no assurance to win even if how much you know the favorite team. That’s why if you want not to lose instantly from your bets, learn to bet at a small amount so that even if you lose, you will still have another chance to bet and win this time. Gambling is still based on pure luck and chances, but I believe if you are also knowledgeable and a skilled gambler as well, that will also lessen the risk of losing from your bets.
because in sportsbetting, even if you know the sports by heart, there are still blind factors for you as a bettor. like the actual health status of the player (if he is in great condition or not), the coach's strategies, the actual lineup of athletes, the mood of the players among others.
so there's no 100% guarantee even in sports betting, because there are some underlying factors that you have no control of.
but your acquired knowledge throughout the years and your passion towards the sports will greatly help you in choosing the best betting line you want to place with.