Be persistent. You won't see your credit score dramatically change overnight. Repairing your credit actually means repairing your credit history. The score then reflects this. The best things you can do now, are pay your bills on time and pay down debt. Even then, it will probably take at least 30 days before these actions impact your credit.
There are many reasons to start on the path to credit repair. The biggest reason is that credit affects you every day. It affects the interest rates you pay on credit cards and loans, including mortgages, and can result in higher security deposits for rentals. It can also affect what you pay for insurance rates and what credit limits you qualify for. Good credit can also mean financial freedom where you don’t have to depend on cosigners to help you make purchases and secure loans.