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As you are getting your source video from YouTube you are already at a disadvantage as YT re-encode uploaded video. This means that the bitrate is lower than the original video that was uploaded and it will contain more compression artifacts. The only workround is to download 1080p or 4k. Forget 720p, it is too low a resolution. H264 video is not a good format for editing. For this type of thing I think you will find Premiere overkill, and there’s that monthly subscription as well.