wait 50 days LOL
That's what this game need to go better... ..-.-'

Just train, and when you train you increase the blue line (proggress) 100 proggress = 1 skill point, or 1 cone

a player of 18 to 22 can win the 100 of proggress easy with 1 training 30% hard... so well... if you wanna do that you will need some days, but, my suggestion is increase the skills.
Better if you have a 5 star player (5*) with 5* defense skills- 5* attack -5*phisicall skills, increase the phisicall to 8*, and if is MC/ST attack skills to 6*/7* too.
First as a option I put in phisicall skills, to have speed/fitness to 9* as soon as posible.