Surely you will get your desired percentile, but for that you have to start working hard from now onward.

Still you have approx 9 to 12 months left for next jee mains examination.

Start preparing from the best course gou can afford.

If you can't afford offline services go for online platform such as Unacademy , PW, Byjus and many more . Gi for good books such as HC verma and DC pandey for physics, Cengage for mathematics and NCERT as well as Cengage for chemistry. Try to solve as much as question you can in these 1 year time gap. Make sure tou give regular mock test to analyse your strength and weaknesses.

Hope this makes you understand what to do for next 1 year.