I have many projects and single action lists in my setup. But most of my projects have their project status set to On Hold (in the someday/maybe zone). I’m not going to work on these in the next 7 days.
I have a small handful of projects that have an Active project status. These become my current Big Rocks and what I am working on within the next 7 days.
When I finish one project, I can go look at my On Hold projects and choose which ones to start up next. Of course, there are projects that fall into my lap that I have no control over (customer request or new project). So I work on those and maybe squeeze in some of my own someday/maybe projects.
It sounds like you have too many active projects and can’t gain traction on any one of them. I’d rather focus on a small handful of projects and work on those.
The app (OmniFocus, Todoist, 2Do, Things, etc.) is just a tool. It is more important to have the system or series of workflows that can help you. Create the foundation and the building blocks that you can carry to any system. I experimented a lot and did a reboot. I restarted with a pen and paper system and then built up my different workflows (capture, organize, do, review). After I got the foundation built, I started to fish around for an app that could do it. The biggest thing that have kept me with OmniFocus was the review workflow. I couldn’t find a review system that I felt comfortable until I got into OmniFocus. I know I can do the review in other apps and am willing to adapt my review workflow to them but I’ve liked OmniFocus’ review perspective the most.
Have you tried Googling for “Omnifocus Workflow” and see what results come up? You might find some workflows that fit you. Or you can take parts of what you liked from others and create your own.
Google is a free way to look for workflows. You will find great value in some of the commercial offerings from respected authors such as MacSparky’s OmniFocus Video Field Guide, Kourosh Dini’s Creating Flow with OmniFocus, Tim Stringer’s Learn OmniFocus, Joe Buhlig’s Working with OmniFocus among other offerings. You’ll most likely get your money’s worth by studying what others are doing and fitting some of their workflows into your own system.