Running a relay to help could be a good start. It's pretty simple[0][1]. The risks associated with being a Tor exit node do not apply to all relay types and the network can be helped greatly by running a standard relay too (standard relays only pass encrypted traffic from A to B).
[0] https://www.torproject.org/docs/tor-doc-relay.html.en
[1] https://www.torproject.org/docs/tor-relay-debian.html.en