Disclaimer: My opinions not a golden rule for winning the match, so I not promise that my recommendation will work for you. It's more observations which can increase your chance to win more matches.
One of the problems with the game is that it's not enough to improve two or three players if you play more than 10 games a day. Even the season pass will not allow you to play only the main fighters, as they run out of stamina. Therefore, you have to balance, based on what kind of opponent plays against you.
When you play Gold Rank 1 or higher, your chance to serve in a match with a Platinum or Diamond player increases. This does not mean that you will definitely lose - Platinum or Diamond rank players experience the same stamina difficulties as you. It is possible that this problem is even higher for them, since they usually play about 50 games a day.
I play in platinum rank and have found several patterns in how pro players (mostly Gold 1, Platinum and Diamond) choose players. I hope this helps you recognize them and field the appropriate fighters.
1. Never pick fighters first. Pro-players usually look at what pick the opponent has and try to pick counter-fighters. If you are picking non-top-tier fighters (Genitz, Orochi, Takuma, K, etc.), then most likely they will not be set up against you either.
2. Be sure to put the main, strongest or second strongest fighter if you pick one of the top fighters. This is especially true of Orochi/Genica/Takuma. In my experience, there are still a lot of pro players who pick K or Kula.
3. Usually the strongest fighter is placed in the middle. The second strongest goes either the first - immediately win the match. or last - if the opponent put the weak in the last round. It's not easy to solve this, but this system can be fooled by putting your top player in the first round, and the second strongest player in the last one, giving up the middle game.
4. Sometimes a third player from the second strongest trio of fighters is picked to save him for subsequent rounds. This gives hope that it is possible to replay him in rounds. although at the end of the season, the players almost do not risk, therefore, most often, they bet the entire main team.
Hopefully this behavior will help you play against stronger players. Remember, if you come across a player of a higher rank, do not leave the match. Sometimes they're overconfident, or they run out of recovery, or you play a lot better. According to my observations, if your character is 50 levels lower or less, you have a high chance to win due
to skills.
Good luck to all!