Usually leadership sets priorities on project work. But if that is not an option, see below:

So you're missing the fundamentals of PM here: WBS. Take something ground up like PMBOK to understand what needs to be done. There are multiple pathways here but a WBS would be the first thing to do. Then understand and create your critical path for one project. Repeat for each project involved.

THEN extrapolate that into a project of managing projects.

THEN superimpose your schedule on top of that. Et voila, you are now a PM. It's really not that bad but I think you're missing some basic stuff that a good PM course would teach you.

Glad to discuss further but my rate is $170 an hour :) just kidding