Paying down closed accounts typically doesn’t help your credit utilization ratio, which is a big part of your scores. So if your scores are your only concern, pay down open accounts instead.
It’s worrisome that creditors have closed your accounts because of high balances, especially if you were paying on time. That indicates you may be carrying some pretty high debt loads. Please check out our resources for paying off debt, starting here: http://cheatgame.info/blog/pay-off-debt/