We all know that on start of every season players lost 20%, but is that necesery? i know it is bcs of balance, equaluty etc etc, it is BS.
When weak abandoned team without manager, fans and training beat us and cost of trophy nordeus says, it is life barca real juve or what ever team had bad day in real life football matches, so it is a bit unfair push real life situation on one side and not accept on other.
Look on teen players like Olmo or Ansumane Fati, do they lost their quality every season or they will progress?
So, my suggestion goes this way
Players from 18-21 will remain they skills on same lvl (putting limit of max % increse per skill to prevent unrealistic incresing skills, just enough to goes up 2 stars in 3 seasons)
Players 22-25 will drop 10% on new season
Players 26-28 will drop 20%
Players 29-end of carrier 35%
That will push changes in youth academy where or have youth team league or assistant offer from academy, eaither way will be offer one player per season quality 75-85
Also it will need change auction-scouting system but this way it is allready ruined so dont see much of lose as it looks atm