Learning and fitness are great ways to avoid the feeling of doom.

Open-source will catch up in <6 months. Note that Meta will ship llama3 anytime. So will Mistral.

I am a PM, and switched to becoming a builder. Enjoy learning, keep building. What people take time to realize is that building things is a habit. As you combine that with ongoing learning, you will enjoy the process and eventually build something to earn a living.