Divineskulls
Veteran
In my opinion, you should go for the 5x5; Pyraminx doesn't take too long to learn unless you really want to get into it, and square-1 is a little complicated. For 5x5, you already know the concept and you could easily beat your 5x5 averages with a Shengshou. But if you want something different, or a challenge, try pyraminx or square-1, respectively.
Are mini magics/master magics competition legal?
Are mini magics/master magics competition legal?