Well, far from being a grammar guardian here, even because I don´t know that much of grammar (a vast field of study), only bits and pieces.
The rest of my days were... (is the first choice by prescriptive grammar - say, by the books) since "wish" goes with "were".
That mainly in academical or formal settings.
But as a past thread on this topic pointed out, there´s the descriptive grammar; and then, both ways are acceptable. https://www.englishforums.com/English/I ... w/post.htm