Hi my friend. I 'm the same level with you and I have started from previous season a guide for fast trainers. Check my signature if you want to go there.
I bought 2 fast trainers this season and you can see my recent results of training (in the latest post) to compare with yours. Unfortunately your player isn't expensive enough to be a good fast trainer (ofc. you didn't tell us his wage and years yet). My players cost me 6,8 and 7,2 millions . As about performance don't wait from the first matches miracles.
Training needs time, experience and resources (red/green packs). If you don't have , sell him asap and buy 2 5* with SA, 24-29 y.o. with the same money.