Unfortunately, you do have a business. Your business sells books on Amazon and you're paid royalties for that.
Whether it is a successful business is a whole other animal.
You are correct to enter the amount received as royalties if you want to be able to deduct any expenses directly related to the creation of the books you're selling.
If you have no interest in deducting expenses then you can just enter this as 'Other Income' which would be box 3 of the 1099-MISC. It will place the amount on schedule 1 of 1040 that way and you will pay taxes on the full amount.
@billmcse
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