[Zetice]

The least relevant or interesting part of this question is what tech to focus on, as you can learn anything enough to be helpful in a few weeks.

The second least relevant part of this question is how geopolitics and current "layoffs" factor into this, as those are largely a product of bad management, and extremely isolated. They won't matter in 6 months, let alone 10 years.

If you are a smart and driven person, then software development is not going to be the best way to maximize your income. Get out of software and into finance, and/or get an advanced degree (MBA or law) from a prestigious university (M7 or T14). Ideally combine finance with an advanced degree, and work at an investment banking firm.

You won't be able to compete with the best individual contributors in software if you only care about cash, and in a hard(er) science field that becomes obvious relatively quickly. In finance, caring about cash is the passion, so that drive to make money will serve you better there.