There are quite a few threads on this site that address your issue.
See https://ttlc.intuit.com/community/credit-score/discussion/how-to-raise-your-credit-score/00/329
There are also resources elsewhere, a few of which are linked to below.
https://www.myfico.com/credit-education/improve-your-credit-score
https://www.credit.com/credit-repair/how-to-fix-your-credit/
https://www.thebalance.com/how-to-repair-your-credit-960377
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