How to make SSL on all subdomains up to the 5th level?

Question

Digital certificates

Hello dear!
It is necessary to "accept" redirects from one existing site to your own. That is, there is https://example.com, and if you add one, then you get to my https://1example.com, where the transmitted URL is further processed. Accordingly, the original site is all on https, so I set myself a wildcard from letsencrypt and it successfully covered all my *.1example.com up to the 3rd level subdomains. The only problem is that example.com has not only ru.example.com, but also, for example, m.ru.example.com, and here, when redirecting, users receive a notification about the insecurity of the connection to my m.ru.1example .com and just walk away.
And I won’t calculate all the subdomains of example.com. There are only a bunch of them of the third level, not to mention the fourth and beyond.
So it looks like letsencrypt is out. Or not?
How do I get a certificate for my 1example.com and all of its unknown subdomains up to level 5?

Answer 1

At 3 you can, at 4.5 you can’t get it in advance.