Hey @bekircem,
I think reinstalling it would of fixed the issue of cloudflared not finding the certificate…
With regards to running Cloudflare as a service - the configuration file you created when running the service manually will need to be moved to /etc/cloudflared.
I’m unsure about linking personal sites here so please let me know if I need to remove this but I’ve covered this under my one of my blogs under the section called: ‘Setup and Run Cloudflared as a Service’
Let us know how you get on!
Alex.