Even though you belong to the Scheduled Cast community, however to get a National Institute of Technology with a rank of 16,906 might not be an easy task. You may not get anything in the 6 rounds of counselling, however you have chances in the Special Round or the CSAB round. The cut-off for other state SC in NIT Mizoram in 2021 was (Special Round II):

Civil Engineering: 201395
Computer Science and Engineering: 149625
Mechanical Engineering: 198866

You can also use our college predictor to see your chances in all the colleges:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope I have answered your question. All the best!