Tips for backward one foot glides in figure skating!!!?

So I am in basic 3 in the USFSA basic skills program. I am really excited to move up to basic 4 and I would like to move to basic 4 really soon. I have everything down in basic 3 but I just can't get my backward one foot glides. I can only hold my left backward glide for about 3-4 seconds and I can hold my right backward glide for about 1-2 seconds at the most. I am also planning to get my skates sharpened soon so that shouldn't be a problem with my glides. I would like to get my backward glides down in about a week or two at the most. I would really appreciate any advice my backward one foot glides and how to to them. Thanks for everything.