That's ridiculous. Take off your yarmulka to succeed in the workplace? I must vociferously object lest some innocent person be discouraged by your post. If you are talented and motivated, you will succeed. Your Yiddishkeit is not an obstacle; it's an asset.
Success in life is achieved by being able to attract peoples attention and trust. The only well paid lawyers are those who carry clients. Doing well is a fiction that only works in school and few narrow technical fields, where the maximum upside earning potential is extremely limited (actuaries, etc).
You can argue that all parnassa is from hashem, but then Talent/motivation are irrelevant, and it the question is only if taking off Yramulka is permitted and required for hishtadlus.
There are many locales and fields where Jews are respected and a yarmulka is an asset (Asia), there are many locales where it is an absolute liability (Saudi Arabia), and there are many place like the US where it's up for debate.