Since you posted this into a self-hosting community…
I have two other websites hosted on a $5 Hetzner server (that counts as self-hosted right?). I’ve been considering adding a Wordpress, Grav, or static site to it. But as mentioned in the OP, I have to worry about the site going down if it gets a traffic surge, so I’m thinking it would be safer and similarly/more affordable to host a Wordpress site with Hostinger or GreenGeeks. Am I wrong?
Grab a Raspberry Pi, slap nginx proxy manager and ddclient into it, and point your domain to your home IP.