Improve video quality by lowering framerate
Theoretically it IS possible, and there are working, practical, proof-of-concept research on the subject.
A couple of examples:

Learning to Extract Flawless Slow Motion from Blurry Videos
Blurry Video Frame Interpolation

The picture below is from the second paper.

However, as of this writing, I couldn't find any feasible-to-use, (commercial or otherwise) software to achieve that.
You could actually use the techniques above to apply it to your video, since they even offer the code on Github, but it would be a great effort, you'd need to basically build a video processing pipeline script/software for that.
It probably would also be somewhat computationally intensive (slow).