I have been selfhosting for 2 years on a Ryzen 3600 bought from Aliexpress, maybe I paid like 90USD.
I use unRaid, which has been really easy to learn, you can achieve the same without it, but it’s simpler for us newbies.
You can easily setup Pihole on it, but what I liked the most is how simple is to use NPM+Cloudflare Tunnels+Whatever you want to expose to the internet without having to open ports on your router
The first thing I selfhosted was Plex+Sonarr+Radarr, my friends and family loves it.