For 2021, you will have to file a 1040NR because you have not yet met the green card or the substantial presence test yet. (The H1B visa is a dual-intent visa, which means that those who hold it are eligible for permanent residency by applying for a green card, but you do not have the LPR status yet.)
See Determining an Individual’s Tax Residency Status.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
