Biggest mistake of my life was to say lets keep maintaining and building on the old thing rather then transitioning to the newest greatest (language, micro-serv

Biggest mistake of my life was to say lets keep maintaining and building on the old thing rather then transitioning to the newest greatest (language, micro-service, whatever). The old thing on your resume does nothing for you. Whatever is the new thing, jump on it hard and fast like your life depends on it.