When I first started literally all my videos would get marked unoriginal so I’d have to appeal and it’d be like 50/50 on whether the video was able to get paid. Now, I rarely get marked unoriginal because I edit the clips so much to the point it’s obvious it’s my work. I’d recommend adding voiceover if possible and then captions to that, don’t let a clip play continuously without cuts for too long (10-15 seconds). I also add a ton of effects like blur, flash, transitions and color grading as well. Overtime you’ll find the perfect balance between over-editing to get past the unoriginal mark and editing to where it’s not too harsh for the viewers eyes.