There are thousands of solutions in this space, focused on every niche imaginable, with a huge range of products.
Everything from simply reminders, to outsourcing, to discounting / incentives, to debt collection.
I’d be very surprised if you can’t find a suite of tools that automate / optimise the portions of your AR process that you’re having difficulties with.
https://apps.xero.com/au/function/bills-expenses (Most of these are multi-platform, or completely independent applications, they do not require using Xero)
She chases down invoices and handles back payments for all of our clients.
The mental overhead of handling these things was significantly hampering my technical work, and the moment she took over, a huge weight lifted off my back.
Part of the aggravation is that you can't automate chasing down invoices, yet. As a person who likes to automate all the things, this would just not do. So I sourced it out.