Make Windwall move forward.
One of the reasons Yasuo is so obnoxious is that he can just sit and dance behind his windwall, and it feels like it just lasts forever if you are a ranged champ. If the wall moved kinda like the upgraded version in odyssey, he would have to play alongside it differently, it would not defend him forever and he won't be able to defend his team from all of the ranged TF damage with just one well placed ability. It would still be defensive when well used, but as it will advance forward quickly it's stationary defense as a bulwark will be hindered, making it more fair for the ranged enemies. You could also try to add an slow to it just to play with it, but I won't add anything else since Yas kit is already overloaded.