may I invite you as succulent lovers to have a look at this site: https://www.fgas-sukkulenten.de/.
I do hope the English version will be online pretty soon: The server was hacked, so they had to start from scratch.
The FGAS = "Fachgesellschaft andere Sukkulenten" = "expert association other succulents" is taking care of non-cacti-succulents. They are not just a club or a gathering of housewifes (nothing against housewifes and their broad knowledge!). They support research and issue a lovely paper four times a year (English & german). The association is located in Germany but works internationally.
Have a look!
A happy new year to you all
Nachtkrabb