@ redmitv

lv12 - max q79 - max value 59-61M (this is the value for fast trainers)

So it's Manolas DC 18 y.o. your top FT you should invest extra greens.
Strootman,Naingolan, Candela, Gervinho, Doumbla, Aldair are 2nd class FT but they have good profile (18-19 y.o., good positions & sa) to invest greens.
Kolarov is also ok (but 20 y.o. so only one more season as FT).
2nd class meaning that for a development of one extra star, Manolas needs 70-75 greens while the others 90-100 greens.

You must invest to those only players your extra greens.
Last day of the season, sell all the others and keep those 8 plus 6 low quality players (like 2* academy or some you 'll buy as 3* players - 2* the next season).
Meanwhile, use all the team of course for the daily bonus training and the daily games.