Yeah I'm using my tactic to sell players faster on average and not even I can get a nibble... I'll share my Transfer Market tactics and I'll wish you better luck than me...
Clubs usually want YOUNGER PLAYERS
Set the prices just right, don't go too low, but don't be too greedy
For players 80 or Below, set them to their max value (Someone will buy them eventually even though this breaks Rule #2)
For players Above 80, Look at their value on the side. For example, let's say you had a player with an expected value of 17.3M and their max value is 43.3M. What should you set their price to? This may put you off but pull out a calculator and do MaxValue-ExpectedValue (43.3-17.3=26) So in that example you would set your player to 26M
Be patient, some players may take longer to get sold but if you keep them in the market, they will be bought.