I would keep all the 6* players (5* players for the next season, which is acceptable).
Also maybe keep the 5* GK, the 5* DC-DR with defensive wall and the 5* AML-ST.
Of course with this team you don't have much hopes for the Cup as the draw will put you in a competition with many managers 1-2 levels above you.
Anyway, Cup needs a different approach.
But it's a descent first squad to begin you league and CH.L. .
You could try sell them today or tomorrow but don't worry.
Next season they will loose something of their value as they will get older but in the first day of the season there are more bidding wars from other managers so maybe you 'll get lucky.
So, start the season with 14 players and don't be hurry to fill your team in Sunday morning.
Wait for Monday evening, when things are more calm.