Secure My Self-Hosted VPN

I need an expert to secure my self-hosted VPN against potential attackers.

Key concerns include:
- DDoS attacks
- Brute force attacks
- Malware and viruses

Ideal Skills and Experience:
- Strong background in VPN security
- Experience with self-hosted VPNs
- Proficiency in Linux and network security
- Knowledge of DDoS mitigation techniques
- Familiarity with malware and virus prevention

Please provide your approach and relevant experience.