The answer to the question you asked is that if your only income is from self-employment of less than $400 and bank interest of less than $10, you are not required to file a tax return. If you file a tax return for any reason, you must report all your taxable income, no matter how small. With the facts you state, if you did file a tax return, you would not actually owe any income tax anyway.
The answer to the question that you didn’t ask is “Maybe, especially if you have a loss“. The question you didn’t ask is, “Should I file a tax return for my small business even if I didn’t make a profit?” if you incurred expenses for your side business, but didn’t make a profit, it may be to your advantage to file a tax return for the business, and report the loss, because the loss can be used to offset future income. For example, suppose you started a lawnmowing business and you bought a $2500 riding lawnmower, but you will have less than $2900 of paying customers this year. While you would have a profit of less than $400 and technically not be required to file, it could be to your advantage to file and report the loss, because the loss can offset future profits. It really depends on the nature of your side gigs, and what your expenses were.
