Rebuilding your credit after filing bankruptcy is not difficult, but takes time. It is obviously important to stay current on any new or existing obligations that you have. Taking out a new loan, even a small one, and making the monthly payments consistently and on time will cause your credit score to increase. I find one of the most important criteria that anyone extending credit to you looks at is your job status and how long you've been with your present employer. Unfortunately, people who are self-employed or change jobs often are penalized for this.
There are no magical shortcuts, but the following resources may assist in your journey. I make no specific representations about them except that prior clients have found them helpful.