I'm trying to write a song, where I go from B minor for 4 bars to the relative G Lydian mode. Then there is a gap of 4 bars followed by a section in the relative A Mixolydian mode.
It's worth mentoining that the Mixolydian-part uses an Asus2 chord instead of A major. The overall tone is supposed to be "sad" or at least not "cheerful".
I'm unsure what I can do in that gap. I thought of starting with an F major chord to imitate an F Lydian (since the Db is absent from the Asus2) which also sounds fairly good, but I don't know what to after that (by which I mean: I don't want to stay on that chord for at more than 2 bars). Continuing with a G major after 2 bars did not seem very convincing to me. Anyway, this is just one idea.
My question is: what are good ways of filling this gap? To make this question more answerable, I'm looking for examples of "sad sounding" songs / pieces that do this exact thing, i.e. going from Lydian to Mixolydian.