Do your users need to access the Horizon infrastructure externally (from the Internet), or are they just users of your network?
Yes, my users can access Horizon from the Internet

Which version of Horizon do you have?
It's version 7.13.1 build-18057992, and this is what I see on the Horizon backend page

Do you have only one connection server, or do you have more servers? If you have more servers, how are you managing the balance?
I only have one link server and I don't have the capacity to add more yet

Why did you talk about port 3088 in point 5?
He is my custom access port, specifically the first address that needs to be filled in the edit secure server screen, which is the external URL, his example is https://myserver.com:443

Are you using a public FQDN certificate or a connection server name?
I use the public FQDN, not the server name itself, for example: https://sina.com:3088

If you want to use access from outside the corporate network, I would recommend using a UAG (Unified Access Gateway).
Thank you very much for your advice, but with my current level of skill, it may take a while to get the hang of this