Try the ones that try to mimic the whiteboard experience, Apple Freeform, Microsoft Whiteboard, Explain Everything, Invision, Milanote, Miro, etc. It really is such a powerful format, as long as some ground rules are established (not creating a totally new board every single time, as there's plenty of space due to digital format, and to prioritize expanding space use rather than wiping each other's notes).

Couple this with a more instant communication form, ie voice chats, and there isn't much else to need when it comes to collaboration. With the added benefit of async communication, you can leave notes to each other on the board/build off things without having to actually be together at the same time.

I will note that if you have a tablet and compatible pen (with app support), it makes it all feel so intuitive. But some people get into the flow of clicking and dragging components with text it's not a big difference.