It is not very difficult to get even a 4* team. In the old system, it was unfair where good 5* teams would not be promoted because they were matched with a ton of good teams, while 2* teams would get promoted because their leagues were terrible. This system is much more fair to everyone.
As for advice to you, I advise going for more players on transfer market. Go for 4* players and low-rated 5* players. You can usually get some of these players for 1 or 2 tokens.