I've been sitting at thinking at what would make a SaaS community good for me, and I have some points here.
1) Drop in some onboarding questions and ask individuals what they have done before and if they are looking to start a SaaS or are already busy with it. (the poll suggests everyone here started). What is not valueable to me is being stuck with people "thinking" about starting something but not actually doing it. Also, by asking individuals what they have done, you avoid the people that are procrastinating on their build.
2) Charge money. Like 1-5 dollar. People don't appreciate free and I can already tell you that 90-99% of the members that have joined will not return and just clicked on join as an impulse monkey. Charging just a little will make people think more because they have to link the card etc, and it acts as a barrier for the impulse monkeys. I've started so many dang discord groups and joined lots of other people's groups and it always happens. People have no attention span anymore and act impulsive.
I would use this money purely for community improvement and be transparant.