About tu upgrade from Centos7.9

If I understand it correctly:
I install Elevate with:

yum install -y http://repo.almalinux.org/elevate/elevate-release-latest-el$(rpm --eval %rhel).noarch.rpm

Then I install:

yum install -y leapp-upgrade leapp-data-rocky

Then I run:

leapp preupgrade

Fixing problems from the log
and finaly I run

leapp upgrade

Is there anything I have forgotten?

Will the upgrade be a like the current Centos installation, or do I need to reinstall packages, do I nedd to remove packages I dont need.
If I understand thing correctly, this will give me EL8, but how do I upgrade to EL9?

Basically it is a server running IP-tables started by a script (Arnos IP-TGables firewall script)
DNS-server
DHCP-server
SSH-server
Webmin
That is basically all that is running.
The setup is headles, I am using Webmin and SSH to admin the server.