How to remove a shadowed area from a photo

Use a Luminosity mask to select just the shadowed area. That should make a curves adjustment much easier.

Another idea is to the correction as @Bojan Živković11378569 mentioned. Create a group of all of these adjustment layers and create a black mask for this group. Paint with a white brush to make the corrections visible in the shadow areas.

But I think you can't eliminate the shadow area complete so you don't see it.

This is a challenge for experienced users. You need to select the shadowed area and then use curves, for instance, to lighten the shadowed area, followed by Hue/Saturation to adjust the temperature, as the non-shadowed part of the photo has a yelowish tint.

Perhaps someone else can devise a quicker and simpler method. This is what first occurred to me after viewing your photo.