If you can afford it, consider running additional nodes on those networks (where useful and sensible - don't host multiple redundant nodes at the same physical site), #Tor and #I2P get stronger as they grow.

Make sure you can safely host a node and understand what it entails. In some countries, #Tor exit nodes are risky to run, in others they're not.

#I2P has no such issue in any country that doesn't ban anonymization networks entirely.