so im writing some acoustic songs for a solo project. and i find myself using one progression throughtout the whole song just with different rhythms. not like one progression for all the songs. like one for each song. is that bad? like i know itd be btter for more than one but is there anything wrongg with it?
If you want the song to have a sense of movement, you'll have to use other methods to create it--makes sure the melody is split into several very distinct patterns, change the rhythms, tempo, or dynamics as you seem to already be trying out.

Nothing wrong with it, but just be aware that the risk of the song turning into one drawn out mush increases when you do so--you'll really have to focus on other techniques for getting it to move.