The specific example here - pushing an organization to use your bespoke Python framework, that you believe to be the best solution for all Python programming tasks - does not inspire confidence.
I'm interpreting your reaction to the thought that "if it's so good, why doesn't it sell itself?" -- in which case I would suggest you put yourself in the shoes of someone on a platform team, or a manager trying to get everyone to do things a certain way, and they'll explain that for brand new greenfield things, adoption is generally much easier, but for existing people and processes change is difficult - so even with a better solution it just doesn't sell it self without some help.