You can only file one tax return. Why do you want to file twice? If there was a mistake on the tax return that you filed, or you left something out, you have to file an amended return to correct it. Filing an amended return is not the same as filing another tax return. An amended return makes changes or corrections to the tax return that you already filed.
You have to include all your income in one tax return. If you have income that you did not include in the tax return that you already filed, you have to file an amended return to add the missing income.