I’ve migrated from cloudflare pages to cloudflare tunnels as I wanted to do a little bit more.

I can’t segregate my network as my ISPs router is rather limited, which means no vLANs. Connecting another router would introduce a double nat as they don't allow bridging. So I'm running my website basically "raw" in a hyperV virtual machine. the website is semi-static and made out of flatfiles, therefore it's is quite impossible to login into it. as stated before i’m using cloudflare tunnels to expose a nginx server to the interner. what are the chances someone or something (bot) inflataring my network? 100% safety is not possible but how safe am i?