MFA is the cheapest control with the biggest payoff.
Microsoft has reported that the large majority of identity attacks are stopped by multifactor authentication. The math has been settled for years, and no other single control comes close on cost versus risk reduced. What has not been settled, at most businesses, is the human side: the rollout that doesn't generate a help-desk riot, the recovery process for the inevitable lost phone, the conditional-access policy that doesn't strand a sales team in a basement parking garage, and the discipline to keep the exception list from quietly growing until it swallows the whole point of the project.
We do the rollout, write the staff communications in plain language, train your help desk on the questions they'll get in week one, and handle the recovery cases ourselves for the first six weeks while the new habit sets. After that it runs on its own, and we keep an eye on the policies and exceptions so they stay tight. Done this way, MFA stops being a project people complain about and becomes a thing nobody thinks about, which is exactly the goal.
"We had a stuck-at-83%-adoption problem for two years. Movalo got us to 97% in six weeks without a single ticket escalated to me."