If you’re serious about wanting more viewers on your Facebook lives, you’ve really got one of two options: either pay to promote those posts, or go live from a Facebook group.
Don’t depend on organic reach, either from your personal profile or your business page (though you really shouldn’t be promoting your business from your personal profile). Thanks to the magic of the algorithm, a big chuck of people you thought would be notified you’re going live aren’t.
There’s only one way you can reach all the people that you’re “supposed” to: get them all into a group, and go live there. That way, everyone in the group will get notified.