I use Filmora 9 with no problem of video degradation while exporting at 80000 kbps. I'm even trying the Pro version, which seems more powerful. I use VSDC Video Editor (licensed version) when I need motion tracking, but the final exported videos are huge in size, even though I export with the same parameters as Filmora 9. Give Filmora a try, I don't think you'll be disappointed with the results.
4k video: Lumafusion
Stills: Lightroom CC, PS Express, Snapseed
Most of these are free or extremely inexpensive, I am cheap