If i paid off all my dept how much will my credit score improve?

It was 726 a few months ago. Since then i was late on 4 car payments, maxed out credit cards (and late on payments), paid my phone bills late and basically screwed up my score. I owe $ 1500 on my car payments and i was wondering if i were to pay what i owe on my car, pay half of what i owe on my credit cards and pay every bill on my name how much will it improve my score? Right now the score is 499

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