I was going to come and also say JS. It is not my favorite language, but it is certainly not going anywhere anytime soon. There is also so much bad code being written in JS right now that entire careers will likely be built doing clean up.
Some people (myself at least) actually like refactoring. There is something really satisfying about coming in and fixing up a badly written Node.js codebase, breaking it up into microservices, etc.
Plus if you want to be a $200+ per hour contractor, this type of "mercenary work" can be really profitable.
