I played around for a while with the progression, which is a nice progression BTW, but found it difficult to decide what the starting key really, so I had difficulty getting a convincing resolve.

I respelled the chords in consistent keys, swapping sharps to their equivalent flats, so bear with the following.

In the first four bars, the Bb, F and Eb suggest a key of Bb Maj, but the addition of the Ab suggests Eb Maj, however in that case one would expect the F to be Fm. Nothing wrong with that, but my mind is unsure where it's going.

The second four bars: Gb Db B Db suggests that it's modulated to Db, but again B major is not in the key, so again my brain is trying to work out where we're going. Again, nothing wrong with that.

The third four bars Gb, Db, Ebm, B also suggests Db and here the Ebm is the two-minor of the scale, probably reinforcing that.

In some respects, the progression is almost designed to unsettle things; it's actually working around the circle of fifths ... that what makes it interesting, but it leaves us unsure where to go next.

My temptation would be to precede the progression with a short intro that firmly established the starting key, so you know where to aim back, then I think it will resolve more confidently.

Jazz relative beginner, starting at a much older age than was helpful.
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