I started music with classical piano and only recently started transposing instrument (bamboo flute), and am trying to get used to movable do solfege. I'm stil

I started music with classical piano and only recently started transposing instrument (bamboo flute), and am trying to get used to movable do solfege. I'm still easily confused when key change occurs or borrowed chord appears. (For the latter there are limited patterns so I should remember them, I guess.)