My hair is mostly 3a but underneath is 3b. I use to have curlier hair. How do I get my curl back?

Some health issues have cause me to lose some of my curl. Also when I was younger I melted my hair off trying to straighten it. Now I just want my curl back. It is a little better since I've addressed my health problems. But should I get a perm is there some products I should use?

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