Any reason this is all one giant project? One of Nextcloud's IMHO fatal mistakes is it tries to be everything. So people have to choose between say, a better todo app, or the one that's integrated with their monolith of choice.

Meanwhile, if you approach each module as it's own project, but with shared code where sensible, and open standards driving your integrations, people including you, can select the parts that best suit them while mixing in software from others where appropriate.