What programs and effects do you use for your older 2D videos? I use Premiere Pro for my videos and I'd be able to mimic some of your pallets using difference layers and solids, but the way they shift color and almost echo when they animate around the video gives them a distinct texture that I want to try to mix with some analog filters.  Also please have a nice day
if you haven't done it already, i think you wanna start exporting and re-importing. it's a magic technique that brings you a new level of results, regardless of what software you use. (my software was discontinued anyway, so you can't use it). take a segment of video, export it, then re-import it into the timeline at exact the same place. then start playing with it in relation to what's already there. then if you want to get even denser, do it again