Some reccomendations:
Get shorter domains for clients/your homepage
Add a note to let the user know that the password field can be left empty. Most user will prefer the randomly generated one.
its kind of weird that only the cPanel start page has dark mode
make the username in the account list clickable
You probably dont want to offer Lets Encrypt for subdomains. At some point youll reach their rate limits, and cPanel wont get SSL anymore.
add a copy button in the SSL setup, that will only copy "_acme-challenge". (or make it so that you can copy this seperatly from the rest of the domain, its easier and faster this way)
Requesting the cert (after you have verified) failed for me for the first two times, you might want to look into that
@Santiago you interested in joining the iFastNet Discord Server? Would probably be easier to communicate that way, especially when youre working a lot on Xera now...