I will not promote. Build a waiting list or launch?

Hi all 👋 I have fully built my web app but no one on the waiting list - launch anyway? I will not promote It’s a web app mainly for events that fundraise for various homelessness charities. Also, it’s got profile upload with liking others and matching and messaging. Then there’s section for reflections and prayer requests. I’ve been active on instagram and MeetUp for about a month and I have a landing page but no one’s signed up to the waiting list. The value prop is “meet people who care as much as you do” and it’s mainly a Christian website. The events are only in London so far but the app says to get in touch if they want to organise one and post on the web app. Shall I launch the web app in the hope that people will sign up when there’s actually something they can use? Or spend more time building a waiting list?