How to limitate 8006 port on the web

Hi, for reasons of need, I need to remotely access some proxmox installations via web interface, I would like to limit access to my public IP, or find a solution that limits the exposure of this port on the web, could anyone help me give some tips or tell me if there are any guides on this?
I looked for something online but nothing. I'll start by saying that unfortunately not all hosts have proxmox 8.x, I have one with version 6.x.
Thanks to anyone who can direct me