Required - Mp4 export settings for minimum filesize and highest quality?

The official music videos and trailers on YouTube have a very sharp quality and a low file size. I want the same settings for exporting my videos such that the quality is the highest and the file size is the lowest. I shoot videos from my phone camera. It makes a 7-8 minute mp4 file video of 1GB file size. On the other hand, a very high quality youtube video of 720 p resolution of approximately 1 hour 15 minutes length has that file size.

What settings can I use in Adobe premiere export settings to get the same result?

The official music videos and trailers on youtube have a very sharp quality and a low file size. I want the same settings for exporting my videos such that the quality is the highest and the file size is the lowest. I shoot videos from my phone camera. It makes a 7-8 minute mp4 file video of 1GB file size. On the other hand, a very high quality youtube video of 720 p resolution of approximately 1 hour 15 minutes length has that file size.
What settings can I use in Adobe premiere export settings to get the same result?