"Spenden" section could favor regular donations

[AiyionPrime]

Donating on a regular basis in form of a supporting membership in FNorden e.V. grants us a larger planning horizon and reduces the need to manually assign different larger donations over a years for a donation receipt.

I think it would help to remind interested donator that small recurring donations sustain our efforts more than single doantions do, while they're still highly appreciated.

Any ideas on how to phrase that in a polite and grateful manner?