Google has given us the day. Google Analytics 4 will become the only option for data collection on in July 2023. Last week, I started to turn on GA4 for some of my accounts that I manage and the process was a little slow and painful.
Search Engine Land have spotted that there might be a migration tool to help move some goals over.
I haven't seen anything on my accounts yet. But, it is something to keep an eye on if you haven't moved everything over yet.