This has been a huge problem for me and I only have just about 75 boxes. Only about 15 or so have been converted successfully to RHEL 7.9 since March, none (successfully) to 8.x after that.
1. Convert2rhel has been a nightmare, only a few have worked properly the first time. I've had 8 tickets opened with Redhat. Once I get one working, the next one will fail with different problems.
2. LEAPP from 7.9 to 8.9 hasn't worked successfully yet. When it does it breaks absolutely everything from PHP to mail sending to databases.
3. I thought Alma might solve the problem, nope. Similar issues as point number 2. Or I get Python errors, or any variety of anything else.
I'm not sure what our path is going to be (maybe Tuxcare or Suse or something), but I'm concerned about my job now since I was in charge of this and it's been a disaster. The anxiety is high.