I think you should try with younger players than now. 21 yo I think is not very atractive. So maybe you could try it with less, but younger players (18-19 only). I would never sign a player with 21 yo with 99%, but instead, I would sign a 18 yo player (with your player positions) for 20T.
yes, usually that's my target but still you can see (with my other player, NEESKENS) I don't have much luck.
I 'm not going for many tokens, 3-5 is enough but as you can read here
https://forum.topeleven.com/top-elev...on-offers.html

it's gives me more a disappointed and wasted time than some profit.
Anyway, if someone is a hardcore player, it's a right way to play.