If your computer is not running a web server, and you have not set AccountingMax, consider changing your ORPort to 443 and/or your DirPort to 80. Many Tor users are stuck behind firewalls that only let them browse the web, and this change will let them reach your Tor relay. If you are already using ports 80 and 443, other useful ports are 22, 110, 143 and 9001.[1] Ports below 1024 are privileged ports, so to use those, Tor must be run as root by setting User=root in tor.service and User tor in torrc.