How to make migrations to FOSS successful on the long term

Most migrations to FOSS are successful on the short term, some on the medium term, and only a few on the long term. The FOSS industry should improve the support of decision makers, who are attacked by Big Tech and their servants, both directly with daily attempts to discredit them in front of their bosses and indirectly by activities of lobbyists who work for the proprietary software alliance.