a credit question?

my credit score dropped last month because of a late (but paid) mortgage payment..i paid off my credit cards except for one with a small balance now i know it hasnt been even 30 days but should i wait to go trade in my car for a different one (im trying to downsize everything) because of my score? i screwed up one month and now im paying for it but i learned my lesson and im tryign to trade all my big possesions into smaller more affordable ones. so is it too soon or will they see that ive paid off a large portion of my debt?