Video Quality Blurry After Rendering/Exporting

This is my first time editing videos so let me know if more information is needed.

I edited my video, with multiple clips and audio. When I play the video from the timeline, the quality looks great and is very clear. After I export the video and play it back, the video appears blurry, almost a lower quality standard definition rather than HD.

My video clips uploaded as mp4 and the following is what I have for the export:
format: mp4
Resolution: 1920 x 1080
Frames/sec: 29.970
Scan Mode: Progressive
Field Order: Bottom Field First
I did not change any other settings (nor above but giving as example)

Please help! and Thanks!

did you try set interpolation to hyper in export?
for some reason shotcut has the worst resize/interpolation by default