Yes, din’t want to use “you” and “your” in the sentence. Those “people” or more specific “learners” would be helpful down the line.

Bulk up is correct, not only…but is correct. However, this sentence sounds like it needs a subject. In an informal setting, you can use “you” in the general sense (i.e. you means “a person”). Here’s how that might look : “Reading not only helps you bulk up your vocabulary, but it also helps you use new words or phrases in their proper context.” If you didn’t want to use “you” in this way, you could say: “Reading not only helps people bulk up their vocabulary…” or you could say, “Reading not only helps learners bulk up…”

I don’t think it has much of a literal meaning. It’s a play on an expression, “to keep your head above water.” That means to keep from drowning, or (metaphorically) to be overwhelmed. You often use “head” and “heart” in contrast to describe thinking versus feeling. So “to keep your heart above water” is a play on words. “Keep your head above water” means (metaphorically) to keep yourself from being overwhelmed. To keep your heart above water, then, would mean to keep from being too depressed.

Totally agree. The English version is better 😄

Great to hear … “close doors” doesn’t seem quite as permanent as burn bridges haha

We fixed it! Thanks for letting me know