Hello Aspirant.

The first thing that needs to be clear is that you cannot get IIT through JEE main examination. For getting into IIT you need to get good scores in JEE advanced examination.

At your score, as you've mentioned that you've scored 69.96 percentile in JEE main and assuming you're a general candidate then at this score you won't be even eligible to give an attempt to JEE advanced examination.

You can try giving more Examination or trying for may JEE main examination.

Best of luck