Tor relays are used automatically by your Tor Browser and tor daemon.
You don’t need to configure anything - in fact, specifying a fixed circuit is a bad idea.
I run a 24/7 unmetered relay from a unique AS to help the Tor network.
Consider running a Tor relay⌗
Please consider running a Tor relay to make the Tor network faster and more resilient against surveillance and DoS attacks.
Among many reasons, please note Bitcoin and Monero viability largely relies on robustness of anonymity infrastructure.