Can't get pins on molex micro-fit 3.0 connector
Every day millions of crimped terminals are pushed into the plastic housing of connectors by workers.
That means that crimped terminals are supposed to enter easily in the body of the black Molex housing and make a little sound or click that your hand should feel.
Are you using the right crimping tool?
The right crimp terminal PN for that housing is: 0430300010
https://www.digikey.com/en/products/detail/molex/0430300010/252480
Are you 100% sure you purchased crimp terminal 0430300010 from Amazon?