which animation course i can do after completing bca

you must first check if you're suited for Animation. Animation is an art form and a very demanding career. It has ample opportunities for the creatively talented people. Opportunities lie in animation design, game design, graphics, storyboarding, 3d modelling, texturing and lighting, Dynamics and VF

As you have done your BCA i would recommend you to take up web designing as this would be a good career option. IF this answer helps mark it as the best or else like it for appreciation. All the best