Ask for help, even from people outside your field. Arnold took advice from a ballet teacher to improve his stage performance. You don't need a language expert to get better. A colleague who corrects your emails can move you forward. So can a friend who's willing to chat in English.

Arnold surrounded himself with people training toward the same goal, in bodybuilding, film, and politics. That environment kept him moving forward. The same works for English. Connect with other engineers on international projects, or other expats learning a new language. You'll pick up more from a weekly conversation than from another app streak.

Ignore them. One teacher's opinion isn't a verdict on your ability. As an engineer, you're already wired for the kind of pattern recognition and structured thinking that language learning rewards. If you want the research behind that, read why engineers are wired to learn English fast.