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Closed accounts with balances impact your utilization. Paying them down will reduce your utilization and have a positive impact on your score.
Your score is improving as your utilization is decreasing. If you close accounts then the total amount of credit you have available decreases and your utilization will become worse. This can degrade your score. If your other accounts are all at low balance, then your score may not be affected, but your utilization will always be more sensitive to any balance you may carry.