If you anticipate that your income will be about the same, simply select "Single/Married Filing Separate" and leave the rest blank. Since you are anticipating earning about $3000 (and the "standard deduction" for you if you were filing separately is $12,550 for 2021), it is very likely than $0 in Federal tax will be withheld, and if any is withheld, it will be an appropriate amount compared to your earnings, which could vary. You always want to leave room for a change in circumstances producing more income than anticipated (less income will almost always produce a refund).
The new form was designed to be "less complicated". I'm not sure it actually accomplishes this, but in your case, I would recommend keeping it that simple.
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