Jessica McCabe is very good about helping people with it. [1] America's experiencing a ADHD medication shortage (perhaps it's global) and some of her work involves how to address things without medication. [2]
I also would suggesting trying to adopt the concept of monotasking / unitasking wherever you can. Multitasking is a myth. [3]
The shortage isn't global; it's an artificial shortage caused by production limits set by the DEA not being adjusted to accommodate the sharp increase in ADHD diagnoses since the start of the Covid-19 pandemic.