how do i get my curly hair back

my hairs is like 2b if i let it air dry, but only at the length, the root are just striaght and flat. i have been striaghting my hair for about 3 years and decided 3 months ago i wanted my curls back. i havent been using heat on my hair. is there anyway i can get it more curly and get root curl?thanks xoxo

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