https://github.com/apemithrandir/self-hosting-guide/blob/main/public-electrum-server/GUIDE.md

I've never got Cloudflare tunnels to work well. Always find that running my own isolated VPNs, each behind a VPS, running Wireguard, is the safe and reliable way to expose services -- for example: https://docs.megalithic.me/the-gentlemans-guide-to-routing-nodes/gentlemans-networking-stack