Making a career change from SRE to cybersecurity expert is definitely possible with the right approach and preparation. Here are some steps you can take to make this transition:

1. Identify your skills and knowledge gaps: Start by evaluating your current skills and knowledge as an SRE, and identifying the areas where you need to develop new skills or knowledge in order to become a cybersecurity expert. This may involve learning about networking, encryption, vulnerabilities, and different attack techniques.

2. Gain relevant certifications: Cybersecurity is a field where certifications can help demonstrate your expertise and knowledge. Consider pursuing certifications like CompTIA Security+, Certified Ethical Hacker (CEH), Certified Information Systems Security Professional (CISSP), or Offensive Security Certified Professional (OSCP).

3. Get hands-on experience: In order to become a cybersecurity expert, you'll need to gain practical experience in the field. Consider working on open-source projects or participating in bug bounty programs. You could also consider pursuing an internship or entry-level position in cybersecurity to gain hands-on experience.

4. Build a network: Networking is important in any industry, and cybersecurity is no exception. Attend industry events, join online communities, and connect with professionals in the field to learn from their experiences and gain insights into the industry.

5. Start your own pentest company: Once you feel confident in your skills and knowledge, you can start your own pentest company. This will require a lot of hard work, dedication, and perseverance, but it can be a rewarding and profitable venture.

Remember that transitioning to a new career takes time and effort, but with dedication and a clear plan, you can achieve your goals. Good luck!
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