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20+ as a developer. I reached your point 5+ years ago and I decided to stay and became a little bitter with the entire team. I took my department and moved to a different part of the org when a chance arose under different senior leadership. There were new challenges I couldn't fully put my heart in because part of me was still with the other team. The place closed shortly after.

Those feelings followed me to my new role where I had to do some serious reflection. In the end who cares if they changed it and made it worse. New VPs come and go often bringing new ways to make things worse. What do you want to do next?

I would use the opportunity to pickup a new language. Take that modern language and use it to open doors that you will find closed in your older language. Maybe pivot into another role in 2 or 3 years in the new language.

Your domain experience will add bonus points if you apply in the same industry and will be slightly positive, neutral or negative in others.

If you want to start a business do it while you are fulltime. Your technical skills are the least important aspect for success. If you can get people to give you money then go for it. If you think your perfect codebase backend solution will make it a success over a stapled together website you've already failed