You are expressing a desire to do something.
Here are some examples:
"I wish I could sing better."
"I wish I could settle the argument."
"I wish I could sail around the world."
*I wish l could stop overthinking
*l wish l could have written my class 10 exams
*l wish l could have an anywhere door
*l wish l could love math
*l wish l could live the life not just exist
"I wish I could remain calm during all of this."
"I wish I could remember his name."
"I wish I could replace my old car with a new one."
"I wish I could play outside."
"I wish I could go to the game with you."
"I wish I could write better."
"I wish I could own my own business."
I wish I could fly in the blue clear sky and enjoy that freedom.
I wish I could go to Hogwarts and become an Auror.
I wish I could own a library with every possible book in the universe.
I wish I could own Drogon.
I wish I could travel the world for free.
I wish I could get an infinite supply of Nutella.
I wish I could meet my favorite actors/actresses/authors/poets.
I wish I could meet my favorite Quorans.
I wish I could attend an Imagine Dragon concert.
I wish I could talk to animals about the pain they suffer seeing their loved ones crash and trashed.
I wish I could talk to the birds to know how they feel to not be a part of the nature show and getting slowly extinct.
I wish I could walk to the trees and cry with them for seeing their loved ones cut down in two.
I wish I could travel with the water and search for a little space to smell and feel good away from the dirt.
I wish I could just transform myself into the things that can't express their pain but are considered to be living things.
I wish I could just crush down the concrete and lift up nature and serve the best to it again.