It can take some time and effort to regain your girlfriend's acceptance, here are some suggestions:
Recognize the mistake and apologize: If there is a mistake or a problem in the relationship, being honest about the mistake and sincerely apologizing is an important first step.
Communicate and listen: Communicate openly with your girlfriend and listen to her feelings and thoughts. Find out how she feels about the relationship and the changes she wants.
Show change and growth: Show that you are willing to make changes and grow for the sake of the relationship, and let her see your efforts and sincerity.
Rebuild trust: It takes time to rebuild trust between the two parties. Maintain consistent behavior, words and deeds that show that you are trustworthy.
Give time and space: Respect her feelings and give her time and space to process her emotions and thoughts.
Actively participate in relationships: Actively participate in the daily life of the relationship, show care and love for her, and make her feel that you value the relationship.
Consult professional help: If the relationship problem is severe, consider seeking professional counseling or emotional counselling, which may help resolve the issue.
Importantly, sincere effort and persistence may help regain her acceptance, but at the same time respect her feelings and decisions.