In this game, the trophy range your in is just natural progression base on your team level and strength.
Psychologically, we want to see progress as we grow our teams and boost them. The monthly reset tends more to kill the progression and just results in frustration to the higher players with level 25-30 creatures.
The problem is Ludia had to do this because the super players would progress up out of range and were not finding anyone to battle. They also instituted the 20 trophy win / 40 trophy loss to keep the higher players from progressing so far out of range, they couldn’t get battles.
What should be done is when you go into PvP, it should ALWAYS match you up with the person who’s trophy level is equal or closest to you. This is just the simple thing to do and for the most part, everyone will be playing others with a team strength closest to yours.
So how to discourage droppers? Are they that much of a problem? At least in my range, 4300, I haven’t had a huge issue. I may run into some over powered team on very rare occasions. Here is a suggestion and I should do a separate post: Just like raids have level caps, meaning your level 30 Thor is bumped down to level 25 for unique raids, so arenas can have a level cap so if someone wants to drop to Marshes with their level 30 Thor, Thor will be bumped down to level 20 and boosts cut in half. This would mean nobody in Marshes can have any creature playing over level 20 till they graduate into Ruins. Ruins cap would be level 22 for example. Lockwood cap would be level 25. Avairy cap would be level 27. Library cap would be level 29. The last two would be level 30. I can do another post for this suggestion.