How many players did we bring in the seasons we won the league and the Champions league?
18/19, we brought in Kieta, Alisson, Fabs & Shaq, 19/20 we brought in Minamino, 24/25 we brought in Chiesa.
In answer to your question - the more players we try and integrate, the harder it is to get the team playing because they’re not familiar with each other, their movement, patterns of play, etc
It’s no coincidence that teams who keep the same core together for longer do better more than teams who change a lot of players.
As cliched as it sounds - it’s about getting 3 to 4 quality players in that’ll make a difference, not 6-7 with half being squad players - overt time yes, but not all at once.