I passed LLB in 1993 but did not register with any bar council. What should I do now?

Basically 20 years gap after your graduation, I suggest you to clear CLAT PG Exam and get Top NLU where you can get a college placement, But you have to clear it with good rank to get NLSIU, NALSAR college for LL.M. to get college placement. as i suggested this because here you can get a job direct