I think that if you are obsolete (and that's a big if), it's not because of languages you don't know, but because of jobs you can't/won't do.
For me personally, that was writing (web) UIs. Learning JS/TS + React was the best thing that ever happened to me. The best decision I ever made. It basically enabled me to crush all such thoughts (about being obsolete) that I had. I no more have to rely on someone else in order to "talk to the world" (express my ideas with software/UI). Now I can market my ideas on a whole different level, even when they are backend/systems ideas. And I was astonished by how much "real programming" there is on the frontend.
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I think that if you are obsolete (and that's a big if), it's not because of languages you don't know, but because of jobs you can't/won't do. For me personally, that was writing (web) UIs. Learning JS/TS + React was the best thing that ever happened to me. The best decision I ever made. It basically enabled me to crush all such thoughts (about being obsolete) that I had. I no more have to rely on someone else in order to "talk to the world" (express my ideas with software/UI). Now I can market my ideas on a whole different level, even when they are backend/systems ideas. And I was astonished by how much "real programming" there is on the frontend.