@bob @gameragodzilla It also helps to speak someone's language.  Allow to expand with an example, to illustrate what I mean by that.

When I used to work for one retailer, they used to use the MS Office suite for stuff.  I'm not going to deny it's nice.  It is, and I still occasionally use it for documents I get sent, or when LibreOffice decides to screw the pooch with updates (as its developed a habit of doing, sadly, at time of writing the latest version just CTDs on running it).  However, it's proprietary, and expensive.

Now, the usual approach of a FOSS advocate would be to espouse the Four Freedoms, and try to explain to those in power at that retailer how they would be bettered by software that respects those freedom.

While that's true, corporate executives don't care about that.