I have never heard of Lumafusion before now, but I just looked it up.
Do you use it on Apple or Android?
I find that usually if a paid-app has an iPad or iPhone version it's probably pretty good software. And I say that as a Android user.

I have the same problem with unfinished projects eating up space on my drive.
I have a ton of them in various states of progress.
Many are just written out with notes and links, but sometimes I've gathered images/videos from online for them already. Some I've even got screen-recordings of footage for.

One of them is a project about replicating my Linux workflow for recording/editing on Android.
The editor I prefer is Kinemaster which lets you use it for free but you have a watermark on the video that says "Made With Kinemaster".
Unfortunately the price is $8.99 a month or $59.99 a year which I think is insane. But you can turn an Android phone into a desktop if you have a USB hub. You can plug any mouse, keyboard, and display in and voila.
I rely very heavily on keyboard shortcuts to edit, and even another PC editor would be a major adjustment for me.

I need to try out Lumafusion because $30 one-time is way more reasonable, and I was unaware of it before now.