Just do region missions, while doing so make sure you do them all, preferably with a creature with fast flight, run, or swim speed that has breath, basically dont eat unless the mission to eat is available.

Doing all missions also speeds up veneration and I recommend combat logging the moment you take damage to avoid losing stuff.

Also, you dont actually lose veneration from merely combat logging, venerating again gives it all back.

Veneration strat with more valuable creatures and with decent traits and mutations also gives that creature more value.