A hypothesis can be defined as a “proposition made as a basis for reasoning, without any assumption of its truth” (Oxford Languages definition). Typically a function you perform to unearth a truth.
A belief on the other hand holds some position on the spectrum of truth. To believe is to make an assertion about truth. A hypothesis is somewhat of a precursor to that.
But hey, regardless of our stance on the definitions of these words, I heavily jive with the idea that we should improve our beliefs over time and I have mad respect for Aristotle.