Surely you are eligible for JEE advanced 2021. The cutoff for ST category this year is 34.6728999. This makes you eligible for applying for JEE advanced 2021.
You can refer the link for the category-wise cutoff for Jee Mains 2021.
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff/amp

Also use the college predictor tool to know about the colleges you can get with the score you have got in Jee Mains 2021.
https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

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