How do you actually beat a Pyro (as Scout)?

I’m genuinely getting tired of having to hold S and walk away every time I fight a Pyro, since I can’t even see where they are through the flames.

When I try to engage from outside flamethrower range, the scattergun just doesn’t seem to deal enough DPS, and I end up landing 6 meat shots that leaves them at 10HP.

Aside from using the Wrap Assassin + Pistol combo just to counter that one class, what do you all usually do against Pyros?