I feel like rift herald needs to give a permanent buff like dragon in order to be prioritized
Between dragon and rift herald, dragon has always been more important in the early game ever since they gave you a permanent buff for slaying it. It doesnt really matter what the buff is. Now dragon is practically a win condition.
They buffed rift herald this season by allowing you to get two of them in a game but significantly nerfed it for some reason.
Either way I feel the only way to get people to prioritze it over dragon is for it to give some sort of permanent buff.
My suggestion
The focus of dragons seems to be champion combat. So make the buff from rift herald be a buff to minions or a buff to taking objectives. This would give teams a good motivation to priotize rift heral.