What do we think?
I don't know what you think, but you sure ask a lot of questions...
Like anything predicting the future, it's "accuracy" depends on what people want to believe. It's far from being scientifically accurate and actually at least once the price was already out of the range. Actually current situation is also a bit out of the rainbow's expected price range.
One can safely assume that we are in an accumulation phase for the next 2 years now?
No. Never assume anything.
Or can we expect some action in the next 2 years?
Because of the halving, some price action is to be expected. But whether it will indeed happen, no one can tell.
Was the mid 2019 a mini bull run?
I'd say that some will tell in a way and others in another way. So .. call it as you prefer.
Currently price is just peeking out the bottom of the "Fire Sale" blue band, is this gearing up for a mini run like in mid 2019?
I surely hope so, but since I have no crystal ball... I can't tell.