Start all over again

[adifairus]

but my advice to you, you don't have to start over again from zero,

just continue using same team because now you got high training level with many drill unlocked and higher level facility too.

right now, just focusing to collecting the rest booster and don't use it,

when next new season start, buy only new 3 FT (18 yr/o) and train them until whatever % you want. (example 100%) by using rest booster you have collected

then make sure to put those 3 FT on every match so they will gain skill until the end of season they will reach 120%.

keep collecting the rest booster also, but don't always use it. just use it if you really need to use for important match only.

then, next season, keep repeating this step buy another 3 new FT (18 yr/o),

on the 4th season, you will have 12 FT players with maximum age 21 yr/o, still young anyway.

then this is the right time for you to aim the treble