Be good at different things or master one thing

I'm a web, ios, android and game developer.

I have done a lot of websites and web apps (wordpress and laravel) then i did couple of ios and android apps (native) for some clients then I learned unity3d and did a game with it for a client but it is hard to master all of them together.

So i want an advise about is it better to pick one thing and master it or to be fairly good at them all "depends on the client's needs" ?