Use the A Blues Scale notes as your main palette over this Blues Min-7 backing track. Keep phrases short and listen for how each note feels against the chord that is currently playing.
A 2-chord vamp is intentionally simple and flexible: because the harmony repeats between only two chords, you have room to develop small melodic ideas, repeat them, and hear how each A Blues Scale note feels against the groove.
This 2-chord vamp moves through Am7 and Dm7. As each chord arrives, aim your phrase endings at notes from that chord. Those target tones are the clearest places to land, and the rest of the scale helps you connect one chord tone to the next.
Start simply: play two or three notes, leave space, then answer with another phrase. Add slides, hammer-ons, pull-offs, bends, or vibrato after the target-tone movement feels clear.