I spend most of my time betting on soccer and tennis, specifically sticking to the top 80% of the most recognizable leagues and tournaments out there. Usually, I’m looking at odds somewhere between 1.3 and 1.5.
It’s not like I’m making a killing or anything—honestly, just take a look at this:

This is more or less the system I run with (don't let that specific odd number trip you up, because that’s just the multiplier I use for my stakes). It’s a bit of a niche approach where if you hit a losing streak, you bump up your bets to compensate. Now, I’m sure there are probably a million people using a similar strategy, so I'm definitely not reinventing the wheel here, but it works for me and I’m happy with the results.
The only reason I call it successful so far is because I’ve only had one instance where I dropped $60 on a single play and actually pulled it off.