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To solidify your knowledge, read. A lot.

To look more competitive, do something worthwhile with what you know.

It's probably worth it in your case, but you'll need to be very careful about planning how it directly gives you an increase in return on investment. College is ridiculously expensive in America nowadays, and I would be very hesitant to go back if I wasn't certain it would lead to a drastic increase in income.

Do not pursue a general computer science graduate degree. Be specific, be intentional.