Hi @jalal0946 & welcome to the community! There's so much that goes into growing your audience with Pinterest... that I feel the best thing for you to do is to sign up & take the free courses/lessons at the Pinterest Academy. These posts will help you find your answers:
https://community.pinterest.biz/t5/creator-chat/calling-all-creators/m-p/2462
@jalal0946 Hello, welcome to the community!
You have to use some SEO strategy to get your pins discovered by the eyes of your target audience. I would recommend you to optimize your pins, add relevant keywords to your pin descriptions.