Can I reverse my changed skin tone?

My skin is dry and fair.

I have always used shade 21 for both powder and cushion foundations. Recently, however, after applying makeup, I felt that my skin tone didn't look natural; it seemed cakey and didn't blend well with my skin tone.

I ran out of the cushion I was using, so it was time to replace it. I ordered shades 21 and 23 together, and I tried shade 23 first.

However, it didn't look awkward at all and matched my skin tone.

I have been doing a bit more outdoor work recently, but whenever I went out, I applied sunscreen thoroughly and carried a parasol...

I'm not sure if I got tanned in the meantime or what. Now that my skin color has changed, the colors of my usual clothes don't seem to match either.

Is it possible to change the changed skin tone back to the original tone?

If you know of any helpful products, please recommend them.