Best Quickbooks solution needed!

I have been using Quickbooks since the 1990's and I really want to continue with it. I once had a small business and that is what got me started.

However, now I use QBDT 2021 for my church, another church group, and 2 fraternal groups. In all the situations, the cost of a subscription is the issue. 

Is there any way to be able to access all four company files from one platform, like I can from my desktop program?

I'd appreciate any ideas or suggestions.