kill the free version if you intend to
1.- continue improving C2 and
2.- make a living out of it.
3.- be profitable
4.- avoid C2 going abandonware.
Already there are lots of requests, like adding a stroke to text since long ago that have gone unsolved, and only by having more income will allow you to fully focus and make a better C2.
tl,dr: kill free version, focus on C2.