You have to accept that the Canon T6 is an entry level camera that records very good video for the price. But it is .mp4 video (already compressed). To achieve the professional look, and pristine video quality, you need to record with a professional video camera or dslr. These cameras use a larger sensor, better optics, and record raw video or use other codecs with very low compression, like ProRes. Lighting aesthetics are also very important to achieve the results you are looking for.
Meanwhile, with your existing footage I suggest you convert it to ProRes and make sure you edit progressive video (ProRes 1080p) instead of interlaced (1080i).
Hope this helps you.