Ask HN: Waking up after a Tech-Coma. What to do?

I mostly program on the side and basically every eight years or so I find the tech I comfortably use out-of-date. I 'surface' to find a completely new world of platforms and technology and try to pick a new one to learn. The advice I get is mostly based on big commercial projects and the latest fancy tech.

Current example: Web: I use AngularJS and can very quickly achieve what I want. I love its capability to run without a server from a local file. I cannot stand node.

Migration Decision: So far I believe I will migrate to Vue.js.

App & Server: I use Google App Engine Standard, but the tools are getting worse and worse. I work on a shared Java codebase with Android Java, APIs on Cloud Endpoints work instantly. Google now pushes Kotlin on the app, I missed platform changes for 4 years.

Migration Decision: I am ready to abandon it all and go Flutter on the clients and Spring Boot on App Engine as the server. Or is that a good idea? Flutter is moving too fast. Whatever I do will likely be out of date in a year....

And there are many other platforms (Firebase Realtime, Firebase Auth, SQL server) that have had iterations, were acquired and have had so many iterations it's impossible to catch up 'after a tech coma'.

Anyone have a good idea how to deal with this? It's almost as if you review and update detailed Architecture Decision Records....