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Merging accounts is not possible on Instagram. What you can do in order to transfer your second account username to your main account, is to first make that username available.
Change your second account username by something like "abcofficialOLD". Next, go to your main account and change its username by "abcofficial".
Keep in mind that you must own both accounts, and if they reach a lot of followers, Instagram may need to review the username change before it takes effect.