Security through obscurity never works, so changing you SSH port does barely anything
... for security that is.
What it does is keep a lot of automated bots from spamming your server. No, they don't have any chances to get access when key authentification is used (and they won't try either... most go for the incredible low hanging fruits like admin/admin user/password sets), but they can become a strain on your own ressources.
What actually helps (and is usually configurable with any firewall) is rate limiting access. Just blocking someone's access for 10 seconds after a failed attempt will make absolutely no difference for you but a big one for those spammers. Now add some incremental increase after multiple fails and you are perfectly set.
PS: 53 is the standard port for DNS when your server operates as such.
PPS: Don't use it. People should really let that stuff die and exclusively run encrypted DNS (via TLS, HTTPS or Quic...)
That's not actualy LAMF material.
Sure, the war Trump started may have heavily accellerated (and yes, sadly that is still only a "may") the move away from fossil fuels. But it also make those people much richer in the short-term. And that is all they care for: the short-term bottom line. The long-term problems are for someone else to solve later...