No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
Impossible to say without reviewing the entire credit report before and after the score change, as other factors may have occured that effect scoing.
Did you dispute the late which lead to it being removed or did it really drop off though either time or goodwill?
If it fell off after aging off or goodwill, you may have gotten rebucketed also I will assume the account still shows on your CR and is open.
Your score didn't drop do to the removal of the 90 day late. You simply received an alert, which generated a new score, but the new score has nothing to do with that late being removed.
Do you have other negative items present on your credit report still? I'm assuming you do, otherwise your score would have shot up something to the tune of 60-80 points. That being said, if you do have other negatives present, it's not uncommon to see little to no score gain from having a single negative removed. It's therefore much more likely that something else caused your score drop, such as a slight change in utilization that was simply realized due to new scores being generated as a result of the alert.