Changing a weak personality is not an easy task, but through some practical methods, you can gradually strengthen your self-confidence and determination. Here are some suggestions:

1. Self-awareness: Understand your personality traits and weaknesses, accept and comprehend yourself. Only when you know where your problems lie can you target them for change effectively.

2. Set goals: Establish clear objectives and develop specific plans to achieve these goals. Move towards your targets step by step, and each small victory will boost your self-confidence.

3. Develop firm decision-making skills: Learn to make decisive choices when faced with options and take responsibility for the consequences. Do not fear making mistakes; each error is an opportunity to learn.

4. Cultivate positive thinking habits: Focus on the positive aspects and learn to see the good in things. A positive mindset will help you better face challenges.

5. Seek support: Share your goals and efforts with friends and family, their support and encouragement will help you persevere. Additionally, consider seeking assistance from a professional counselor.

6. Build self-confidence: Participate in activities that can enhance your self-confidence, such as public speaking, sports, or learning new skills, gradually strengthening your self-assurance.

7. Keep exercising: Physical strength contributes to mental resilience. Regularly exercise and maintain a healthy lifestyle.

8. Learn to say "no": Learn to reject requests that are detrimental or unsuitable for you. Learn to protect your interests and stand by your position.

9. Develop self-discipline: Establish a good daily routine, including early to bed and early to rise, healthy eating, and regular exercise. Habits of self-discipline will help you better manage your time and energy.

10. Continuously learn and grow: Keep learning and improving your abilities, which will increase your self-confidence and determination.

Remember, change takes time and effort. Do not expect to completely transform your personality overnight. Persistently apply these methods, and you will gradually find yourself becoming more resilient and confident.