After almost 21 years of my tight curls, I have finally decided that I want to try to loosen my curls significantly. However, I have never tried any chemical treatments before, and I hardly straighten my hair because of the time it takes.

Here are a picture of what my curls look like:

However, that is not how long it is. I cut my hair recently to my shoulders, and it is a tad thinner, but the curl sometimes gets a little tighter than usual.

Does anyone have any recommendations as to what I can do to achieve looser curls or have something that they've done? I've heard about Keratin treatments and how they can help, but I've also heard they are really expensive for upkeep

Thank you