It or them: How to refer to a single noun followed by any with a pronoun?

Question

Is the sentence below correct?

I want to say I can't merely rely on self-learning in order to become proficient in my career, and I need better resources.

Although self-learning is an essential factor of success for any career, I believe it isn’t enough to achieve full mastery in them.

Or do I have to say it this way:

Although self-learning is an essential factor of success for any career, I believe it isn’t enough to achieve full mastery in it.

However, as both sound a bit awkward to me, I would appreciate it if anyone could suggest me better substitutes.

Answer 1

I think your second example is closer, but both are still awkward. Maybe other terms for "Self-learning"?

In both sentences it is unclear whether "mastery" refers to the skill of self-learning or the field itself.

• Self-learning is a valuable skill in any career, but true mastery requires proper resources and support
• While independent learning and self-directed growth are important, true proficiency in a skill or field requires feedback and support.