In the spirit of trying to help colleagues in a similar position...
When Advanced notified us that they were halting all development of the product, I saw the writing on the wall and started to look at alternative MIS systems immediately, with a view to having something set up by July 2023. Never did I imagine they would pull the plug so soon and I cannot imagine what schools must be going through right now. I did 3 months of research, meetings and investigation. We were a big user of Cloud School - I had developed my SSRS skills and we had a suite of widgets to support staff, students and parents alike. All students and parents used the portal, so getting a new system that allowed us to continue to build on this base was important. I have just signed a contract with a new MIS provider.
If there are schools out there who would like to know more about what I looked at and the reasons for the choices we made, I would be happy to share them. If there is enough interest, I could host a Zoom meeting to prevent having to repeat myself over and over again.
I have not really used EduGeek much before, but this is a place I do go to from time to time (usually when there is a problem), so I am guessing some of the schools affected may be looking for guidance. If others know of other forums that may find this helpful, do let me know!