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Your plan is solid. The important thing is that you configure those things correctly, but you’re following guides so that should be ok. It’s on a VPS so there’s no threat to your home network, and none of those services pose a significant risk to you even if they were compromised so there’s no reason to go overboard.
If I had any further advice to give it’d be:
Change any default usernames and passwords that any of your apps/databases use.
Use randomly generated passwords for all service accounts. So that if you do find yourself compromised, they don’t then know a password that you’ve reused somewhere else (like your email account).
Run those services using something like Docker with no access to each other.
Utilize your VPS provider’s cloud firewall if they have one. If you’re paying for a cheap VM, it shouldn’t need to deal with all the general firewalling from the internet. VPS providers often have free cloud firewalls you can offload that work to.
Docker is the way to go. More often than not self-hosted stuff already has docker instructions, and by design it doesn’t mount your entire drive or give access to really anything on your system unless defined explicitly, even networks are isolated iirc. OP, get educated on what docker is and what flags it has so you can easily see what has access to what before even spinning something up.