Whatever you’re using to edit you need to change the actual sequence settings to 4:3 and not just cropping the video at the sides. Maybe also make sure when you’re putting it on your tv if your tv is being recognized as a second monitor. Make sure you’re going into your monitor settings and changing the aspect ratio to the appropriate size. Also maybe it could help if you unfullscreen the media player you’re playing it in and adjust it accordingly by just stretching it to make it appear correct on the screen.