You normally get whitelisted in about 2 weeks, its the standard waiting time so the admins can look at your request and verify you.

You weren't. You're still whitelisted. Try connecting again.

in the minecraft launcher, go to 'installations' and then click on 'new installation'. click on the drop-down box under 'version' and then select 1.20.1. you can name it whatever you like, but i would recommend naming it '1.20.1' so you remember! you don't need to change any of the other boxes, just leave them as they are. then click 'create' in the bottom right corner. once that is done, go back to the main screen under the top sections 'play' and in the drop-down box that is to the left of the green 'play' button, select the new 1.20.1 installation that you just made. then click the green 'play' as normal. minecraft will launch in that version and you should be able to join! there is also a 'setup' page on this website which might be useful. i hope this makes sense and has helped!! :)

doing it this way also does not mean that you will lose what you have in 1.20.2! you just need to start minecraft in the right version when you play on this server, you can switch between them easily with the drop-down box!!

It may take a day to weeks, it depends. just so I can help you