Dysport tachyphylaxis or immunity?

32F started getting Dysport q3-4 mo at 30 w/ great results. Units distributed betw horizontal lines, glabellar frown lines, tail of eyebrow. Started to experience minimal to no effect/results about 1 year ago (60 units 10/14/2020, 86 units 12/1/2020). Having no results, I've gone to 2 other providers since, making appts ~q3 months using combos of Xeomin, Jeuveau, Dysport. 5 days s/p last appt still have fine lines upon resting, wrinkles on muscle activation. Case of immunity?