~~don't run tor bridges, they are publicly listed (the protocol needs this) and bad, influencial people put their IPs on IP blocklists for website operators. as I know, snowflake shouldn't be a problem.~~
monero nodes don't use the GPU, if you have the storage you can run a node too. maybe you don't want to host it on the clearnet, but only as a hidden service, you could do that on Tor and I2P. make sure it's listed on the monero.fail site
you can also run an I2P router. by just having it run in the background you contribute to the network with your bandwidth. if you have an always on computer, it's better to run the router on that, because in I2P routers do "routing commitments". if you just quickly shut down the router without waiting for these to expire, connections using your router will break. you don't need to take this too seriously, but just don't run it on the PC in public mode if you can't solve this there