I don't think my own choices in how I spent that first year or two are quite relatable, but I'm sharing anyways. I was at peace about my decision by the time that I filed. My mom had also received a terminal diagnosis months before I filed and was gone within months of the finalizing of my divorce which was a 9-10 month process, each were actually. That said.
I cut the cable cord and left only internet access. I spent time at the library. I ordered workout dvds. I followed sports and only sports, which I love to follow. I read an enormous about of literature in genres that interested me. I spent time living in the moment. I disconnected from social media and used twitter to follow sports and only sports and there's actually some health feeds and travel site feeds still at the oldest followed section of that site.
So yeah. I spent time doing for me what I like. My core.