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Hobbyist/Enthusiast here. Most of the bots are autonomous. They are deployed and constantly sniff for any little cracks and crevasses in the armor. Don't be fooled tho, they are quite sophisticated. I see some have mentioned fail2ban, and Crowdsec. Both are very capable. UFW (uncomplicated firewall) is also very good. When I set up UFW and my external, standalone pfsense firewall, the way I go about it is to block everything, then step by step, open only the ports that absolutely have to be opened.
Tailscale is also a great overlay vpn along with netbird. Tailscale can also be used as an emergency entry to your server should you lock yourself out, so it has multiple uses. Additionally, since you say you have technical knowledge, Cloudflare Tunnel/Zero Trust pretty much wraps everything up. I know there are a lot of selfhosters dead set against Cloudflare, so that's a decision you have to make. Cloudflare does not require you to open ports or fiddle with NAT. You set it up on your server, Cloudflare takes care of the rest. If you wanted additional protection, you could install Tailscale as an overlay on the server. The caveat to using Cloudflare Tunnel/Zero Trust is that you have to have a domain name that allows you to enter and use Cloudflare's name servers for obvious reasons. You can get a domain anywhere although Cloudflare will sell you one if you wish to go that route.
Since I am the only user of my server, I've taken the additional step of implementing the hosts.allow/hosts.deny TCP Wrapper ACL files (although you can have multiple users with hosts.allow/hosts.deny). If you go this route, make sure you do the hosts.allow, so that when you edit the hosts.deny you'll enter
ALL : ALLfor a default‑deny stance. For my purposes, multiple users cause multiple issues, so I don't share. :pProbably should go without saying you should use ssh keys when administrating the server via ssh.
ETA: Hope everyone is safe in the US with this frigid weather.
ETA2: If you decide to go with Cloudflare Tunnel/Zero Trust, I have some notes that seems to have helped several people and I would be happy to share them.
Please do share your Cloudflare notes.
I left tit in the box