Keep no1 , he has good q, sa and can grow more.
No2, he is medium trainer, 21 y.o. without anything special (if you can find players like ST-AML/AMR/AMC go for them. Avoid STs with special ability. They attract too many bidders. You 're gonna waste a lot of token. Sell him this season and check if you can find smthing like above, 18-19 y.o. max.
No3 not a fast trainer, single position , not good sa for his position and skills. Sell him this season, best choice a DC-DMC Aerial or defending wall.
Wanna be DC-DMC-MC or DMC-MC-AMC . Great coaching tools.
No 4 - good
No 5 good
No6 good
No 7 good - but try to find defenders with double position (DL-DC, DR-DC, DC-DMC) if you can.
The rest sell them and get 3* with 50% quality
Finish the season with 7 5-6* and 7 3*.
* tab a like to remind me that you made a new post.
Ask here (or somewhere else) but not with pm.
My box is almost full.