hi,

yes of course you can  appear in next year neet ug exam which is the only gate way entrance test to take admission in health science related course in India. if you dont accept the seat or not take admission in any of the college you can not take admission in any college through counselling portal. however you may take admission in any college in any course and then again appear in neet exam next year. so it now depends on you, whether you want to take gap of year or take admission in any course.