Geyser is amazing. I’ll paste a link below to a previous fundraiser that was very popular on nostr so you can see an example of one that was successful. In addition to passing through all donated funds, the geyser lightning address they can give your project can receive zaps if you connect it to your nostr profile, or any other nostr profile if people want to support you passively that way. Then any zaps received go toward meeting that fundraiser goal.