The truth is that there is no trick to slot machines. They provide random results based on set mechanics and it all comes down to luck. With that being said, not all games are the same, so picking the right options is key, and you can still change the size of the bet throughout the session for better results.
Here's more about each of those 10 best high RTP slots along with information about where you can play them.
Mega Joker 99% RTP. ...
Codex of Fortune 98% RTP. ...
Starmania 97.87% RTP. ...
White Rabbit Megaways 97.72% RTP. ...
Medusa Megaways 97.63% RTP. ...
Secrets of Atlantis 97.07% RTP. ...
Steam Tower 97.04% RTP.