people new to freelancing don't have the cash to put into a subscription tool, and probably don't think they need these features you provide. (if only due to lack of experience)
Freelancer Pro's are already doing their lead generation workflows, and whatever it is it's working, so the majority of them are not going to be actively looking for new tooling.
So it seems like the core demographics that would be interested in your product are: 1) pro freelancers frustrated with their current workflow 2) junior (but not novice) freelancers ready to take their lead generation to the next level
both of those demographics is probably pretty small. probably you need to broaden the features, but as mentioned elsewhere, you should follow up with your potential customers as to why they drop off. maybe even offer 1 year of free usage to them, just to see if they can get value from your product, and learn from them.