Hi, Dewy.
The only advice I can offer is to think melody, knowing that melody loves chord tones. If those chords you mention (which are obviously from the key of A) are in fact 7ths, then you have a nice choice of notes to choose from, namely the 1-3-5-b7 of each chord.
If you want to post a backing track of the progression, I can be more specific.
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