HELLO,

Since you have already tried all JEE Main attempts , not qualified JEE Advanced and scored below 75 percent in class12th , IITs/NITs/IIITs are not possible , but you can still pursue Btech/Graduation in Aerospace or related fields through private universities that do not require JEE or 75% criteria

Some universities include :-

1.LPU

2.UPES

3.Amity University

4.Jain University

5.SRM

These universities may take their own entrance test while some might can give admissions based on merit.You need to decide the colleges and university of your specific choice then you can apply for admission through their official websites.

Hope this will help you!