Players need to form an union and demand fewer matches. 18 club la liga, cutting the teams in champions league and dissolution of nations league come to mind.
You know if they form a union, they will do the exact opposite, right?
Less games = less money.
Less teams = less players getting paid at top level.
And because only small percentage of those players play that much. Cutting games, especially in the league, will mean less money for the lower players whom actually need that money more. OTOH, top players won't care that much.
Players and agents greed are one of the main fuel for those extra games.
PS: Liga actually has a player union.