Birthday message for ex-members only after a year of becoming ex-members

Hello,

I'm getting stuck with this problem. We send an email to ex-members with a birthday offer.

We have that automation correctly setup but a change is needed. We need to wait 1 year after they become ex-members and then, run the campaign. 

For example: 

I can't seem to find a way to do this with the wait step. Does anyone know what I need to do or if there's another solution already written?

Thanks in advance and best regards.