@jadaadams44
When you have income that varies, such as your side gig job, all you can do is make your best guess as to how much you will earn for the year. If you think it will be about the same as 2023, you can use that amount. Later in the year, if you find that you are making a lot more than you expected from the side gig job, you could revise your W-4 again.
Yes, it's up to you whether to have more tax withheld. But don't overdo it. Getting a large refund when you file your tax return just means that you gave the government a big interest-free loan. You let them take money out of your pay that you could have used during the year. Ideally you should try to have enough withheld so that you owe only a small amount on your tax return, or get a modest refund. You want to avoid having to pay a penalty for not having enough withheld, but there will be no penalty as long as the amount you owe on your tax return is less than $1,000, or you get a refund.
What xmasbaby0 is trying to tell you is that the IRS is not going to check your W-4 or tell you that you filled it out wrong. The amount of withholding is up to you.
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