Hi, im kinda new to the game(Im at level3 and from tomorrow I will be level4)

As the players loose their quality in higher levels each season I was decided to sell all the 25+ players with their price at level 3 to get new players in level4.

I wanted to know if Im doing the right thing or I shouldn’t do this?

Pm: Is there a big difference in price btw the level3 and level4 players?