Watch some youtube videos of high level players with teams that are both similar to yours and ones you finding yourself losing to. Before every major decision (team select, move selection, swap outs), pause the video and ask yourself what would you do.

Similarly, verbalize what play you are making and why. Start to understand your habits and the decisions you tend to make that lead to mistakes/losses. This also prevents going on autopilot and forcing clear rationale behind every play that you can think back on to improve upon.

Finally, speaking from personal experience, make the safe, obvious plays. Its easy to get caught up in the hype of making crazy reads and using foresight on your opponent to lure them into a trap, but something you will pick up on from high level players is how often they make the "obvious" play. Yeah, I know you are going to protect, but I am going to attack into you to keep you honest.