I have given it some thought, and I shall tell you what I wish for.
I wish to reverse places with my brother. A simple wish, but with requirements.
I wish to be king of Asgard, and have my brother be the pariah, feared and disgusting to the people. I wish for my crimes to be his crimes on the records of the realm, with whatever realistic alterations might be necessary for how the Thunderer would attempt to bring a world under his hammer, rather than how a trickster might attempt the same. I imagine slaughter to be part of the narrative, as that is how our wars typically are undertaken. I wish for him not to have succeeded, as I did not, and now be a criminal without a home, as I am.
I wish for no other alterations to take place. No removal of my knowledge, magic, memory, or skills, no alteration to my body or mind. No other alteration of the government of Asgard. I am wishing for it to be as if I ascended the throne, not he, when our father was declared an absent monarch. I wish for it to be fully right in the eyes of the laws of succession. No raging civil war when I arrive.
I wish for no alteration to his person or abilities. I will not even take his hammer from him. This is an alteration in circumstance, not in person.
In our current states, as we are now, I wish for him to be treated as I have been all my life, and for myself to be treated as he has been. I want to teach him what it is to be despised.
I want these things for a month. After that time, if I so choose, I wish for the power to revoke this change, and put things as they were again.