At a rank of 14000-16000 in CLAT what is the next step I can take? Which are the colleges I can opt for

Hey.
Considering your expected rank you would not be able to get admission in any of the NLUs.
The other options that lie with you are the other law entrances except CLAT that you took.
Other than that, There are many colleges that are not NLUs but accept admissions on the basis of your CLAT scores, you can consider them too, like-
Nirma University, Ahemdabad
Amity Universities
MS Ramaiah College of Law, Bangalore
School of Law, University of Petroleum and Energy Studies, Dehradun
School of Law, GITAM University, Visakhapatnam
Alliance School of Law, Bangalore
Ansal University, Gurgaon
ICFAI Law School, Dehradoon
IFIM Law College, Bangalore
JLU School of Law, Bhopal
Manav Rachna University
The NorthCap University, Gurgaon
Check the link below for a more comprehensive list
http://law.careers360.com/colleges/ranking/top-private-law-colleges-in-India-accepting-clat-score