Thinning after going natural? HELP!

Total hair emergency! So It's been a month since I've gone natural and I got it straightened yesterday for a length check and it grew maybe about half an inch but its soo thin! Way more thin than I remember it being before I started transitioning! While it was curly (I have 3b hair) It didn't seem thin at all! I began transitioning to help get longer mainly but also thicker hair and I'm so worried! HELP!!!

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3a, med porous, low density
Poo: Have to admit I have recently become a Wen convert. Love it. I have always had problems with my hair "hanging" right, curling uniformly and destorting the perimeter line. Wen makes it hang evenly.
I think there needs to be more information posted about your hair routine because honestly it could be anything.
Start by answering the questions below and we are more likely to be able to help you.
What is your routine? What products are you using? What tools are you using to detangle your hair? Is your hair dyed? How often do you straighten your hair? What do you use when you straighten it?