The one and only reason why you don't see any 5* players is because you are at the highest end of your server. There is probably no one on your server from the higher league than you are, therefore they are not going to be selling 5* players because that still serves purpose on their team. Solutions: 1) Buy only scouts and not from the transfer market. 2) Intentionally avoid promotion to the higher league for one or two seasons by playing illegal formation, out of position players, etc. That way you will let teams pass you and your transfer market will look much better after those seasons.
Good luck, I'm in the same boat as you are. I opted for solution #1 and are considering solution #2 some time down the road..