Ok, I feel I should amend my statement somewhat after a few days and after rewatching some old movies from the Funky Visions crew. Dissolves CAN work, but you should keep them significantly shorter than you have them in this video. A lot of your dissolves in this video seem to last a whole second, which makes it look kinda ugly since you can visibly see the clips superimposed on each other. (1:45 is a pretty good example of that). I like hard cuts, but I know that they are jarring if you don't cut on beat or at a moment that's otherwise convenient for a transition. If you want a softer transition, a short dissolve (maybe 1/6th of a second? I think that's a good benchmark but I haven't edited in a while) will get rid of the jarring nature of a hard cut without looking ugly because it goes by too quickly for the viewer to really notice the superimposition.
https://www.youtube.com/watch?v=UkyzTu-Owd8&t=6s <-- there are a lot of good examples here of quick, unobtrusive dissolves
If you want more ideas for transitions I would honestly go and watch some of the well-known older editors in the scene - off the top of my head, NaF, Cla, Torn Productions, and ikpure come to mind. There's definitely more but those are the ones that pop into my head. Much better than reading my rather rambling thoughts.
P.S. Watching that video again, I saw that you have some dissolves that actually work quite nicely, but I didn't notice them the first few viewings because I didn't notice them (because they were short (and therefore not visually jarring(and therefore did not break my immersion in the video)))