The #1 bit of advice is don’t confuse Free with a marketing strategy.
It isn’t. It’s an onboarding strategy.
Simply making an edition of your business app “free” will almost never on its own attract a significant number of users, unless your app is viral.
If you already have a ton of folks coming to your site, and you think it’s more effective to maybe let the low end use the product for free … that can work.
But putting up a sign that says “Free” doesn’t attract users. It hasn’t in a very long time. There are just way, way too many apps out there.