Looking at old posts it was stated it would be 2 weeks after it is made live 23.1 went live on the 3rd march it is now the 30th March and I have restarted my CE and it is still 22.4 and all the documentation in the academy is for 23.1.
Discussion posts and replies are publicly visible
Found this on Appian CE guide
Since you have manually restarted CE site from a shutdown, may be you will not get the update now.
It also says:
So, to get latest version, you need to request a new environment