I will never get tired to repeat this: There is nothing worse than bet your engineering career choices on some current hot bell & whistle or even maximizing sa

I will never get tired to repeat this: There is nothing worse than bet your engineering career choices on some current hot bell & whistle or even maximizing salary. First, you can't possibly know what will be next big thing in 10 years. Second, your main skill that you sell is not a specific language expertise (except maybe few niche cases) - but your engineering skill (surprise surprise), not coding per se. To become good at engineering requires a lot of time and effort, it is hard, it challenges your motivation. To keep as much motivation as you can - you need to choose areas, domains and environments that you personally like, enjoy working with.