Low Quality Render With 4K Footage

I have been trying to export this visual I made on media encoder, but every time I try, it comes out low quality, although the original footage I used was 4K quality. Attached is the original video, my edit, and my export settings. This also seems to be a problem during playback in AE as it also looks to be low quality, so is it something to do with effects making the video lower quality? I think it may not be the exporting being the problem but the effects, but why do the effects make the quality lower and how can i fix this, or is it the export settings?