Read some books on the subject and within a year in this new domain you'll be much better. Did you forget your whole life before the last 3 years?

Yes, certainly, in a year I’ll be better. But in the meantime…? 3 years ago it would be understandable for me to take my time with the tasks I’m doing because they are complex. Now it would be unreasonable for me to spend enough time to understand the nuances.