I thought about a separate account but... it's not ideal. You know, constant relogging and such, keeping it all in one account would be a lot nicer.
My current solution is to prefix non-public prototypes with ` _ `
As for the soft project limit, I did not know that honestly, it seems quite low too. I will for sure send itch an email about that then :v
I already have 12 projects on my account, only 5 of them are prototypes/experiemens even!