Offer an oppurtunity for creators to promote VRC+ and get a commission of it.

This is common in e-commerce and also some games have incorporated this system (such as Support-a-creator in Fortnite).

This could boost your VRC+ conversions, since creators themselves would promote VRC+, VRChat and their fans could support them aswell.

You could also do the same for VRC Credits.

The amount of % I will leave up to you, you know the margins etc.