1 Adding the option of special trainers that can be hired for one player to develop only one thing he has, like what players do in reality, for example, a player who is bad at free kicks hires a fixed kick trainer. 

2 Adding more attributes and giving the ability to train a player on them or even delete his bad attributes in exchange for gold or euros. 

3 Focusing more on the tactical side, such as adding an advanced or late offside line. Adding the type of passes, short or long. Free kicks, do you shoot or pass? 

4 Redistributing the skills of the players, for example, a full-back in defense cannot be given the same focus on the same skills as a center back. The same goes for the rest of the positions. 

5 Adding the option of player morale for each player individually, it decreases if he does not play much and increases the more he plays, also if you want to raise it, you pay him money and so on. 

6 Adding the option of direct negotiation between coaches for players and not waiting for the auction

Number 6 would be perfect for the cloning cheaters, they could send good players for a few cents to the main account, instead of buying overpriced players and paying taxes as it is now... that will never be considered.

Something more feasible instead, to enhance the transfer market, could be allowing the users to set a price for direct sale to each player, in addition to the auction. Whoever is willing to buy that player, can offer that price to immediately start the usual 48h auction. But there must always be an open auction when selling players between two users

1. You can already choose what set of skills do you want to improve

2. Immediately p2w.

3. Could be interesting.

4. Immediately p2w.

5. I think it will be to complicated to implement.

6. No. Thousand times - frauds, scams, friends helping, match fixing.