Income Tax & GST Related

Dear experts, A. Y 2020-21 My Gross receipt is 3468212/- my Net profit is 451830/- my work is yarn spinning as Job works. I m not registered under GST. Only two year income tax return submitted. BUT THIS YEAR A. Y 2020-21 EXTRA WORK IN THIS YEAR. AS PER INCOME TAX NO TAX LIABILITY. BUT I CONFUSE IN GST MATTER. CAN I COMPULSORY IN GST REGISTRATION. AND THIS YEAR A. Y 2021-22 I close this work. These job work is not parmanent. Pls suggest me.