Best way to dive in?

So I main win pro and mac os, for desktop and android and iOS for mobile. I have a tiny amount of experience with Ubuntu installing on flash drives and occasionally booting into Ubuntu or Mint.

I’m prepping for the A/Net/ & Linux+ exams for before the end of the year but need to find a way to force myself to dive head first into Linux so I can learn it better and it become more familiar and muscle memory. So far having VMs installed and occasionally booting into them isn’t enough.

Any tips for going cold turkey into Linux? Any ideas on how to make the transition easier of a process?