While those are go-to methods for most people, 10 years of analyzing 1000s of credit reports on a monthly basis has shown me these methods would either lower your score more, delay you reaching your credit goals by years, and waste a lot of your money.
Disputing (by mail, not online) has proven time and time again to be the best method for working on your credit issues.
I would never tell you not to. In fact, the laws that are used in credit repair are put in place for consumers to use themselves.
The problem is most consumers don't have time to read through the Fair Credit Reporting Act, the Fair Debt Collection Practice Act, and others while seeking to work on their credit.
Not to mention, most of the people I help that have tried to do this on their own say that they end up frustrated, confused, and stuck after doing all they could for months.