Let me think and I will edit xD

1- Change the training system and do it uniform for PC/Mobile, create a specific training for defense/attack/phis&mental so auto add in mobiles will be eliminated as we have more happy people in PC in this field.

2- League, winner decided not per GD, make it real, so goal average rule.
Champions league if there are not enough teams take the 5th.
Cup of same level.

3- In PC the game can be more developed, would be interesting create competitions in what other teams can joing paying a feed, and then the winner have a trophy and a price. game will be more fluid with that.

4-Tops in all competitions + GK's, and MoM too in the looser team if needed.

5- Target of the season + a price to achieve. Beauty, that to win every competition we obtain a prize, but I think that specific tagets per level, or season will motivate more.

5'5- Academy players of 5* in the place of 4*and another of 2*... or 4* x2, one free and one paying.

5'6- Tops of better players per server, CL winners, Cup winners, League winners... etc.... even if it's only avaliable in a PC page people will like it.

5.7- 1Token Contract to test a scout in a friendly.