I wanted to change my storage plan from personal to family. My wife invited me to join her plan but mine could not be cancelled so that I join her according to the invitation she sent me.
Apple's support document Share iCloud+ with your family might have some tips for you. See the section of this document called Switch from your personal iCloud+ plan to your family plan where it describes how you can switch from your own iCloud+ storage plan to a Family Sharing group plan.
Your questions isn't clear about your status in the Family Sharing group. Did you manage to join your wife's group and not transfer to her iCloud+ plan, or did you fail to join her group?
Apple's support document Share iCloud+ with your family might have some tips for you. See the section of this document called Switch from your personal iCloud+ plan to your family plan where it describes how you can switch from your own iCloud+ storage plan to a Family Sharing group plan.
Your questions isn't clear about your status in the Family Sharing group. Did you manage to join your wife's group and not transfer to her iCloud+ plan, or did you fail to join her group?
I couldn't join my family sharing plan even if I have invitation to join from my wife
