To answer OP's question briefly: you will learn about the job market - particularly community - when you apply to jobs. Unfortunately, there is no other great resource.
I don’t know why neurology isn’t more popular
It's getting more popular, but the answer is there is nationally very poor exposure to neurology in medical school. A large percentage of medical students either do not rotate in neurology or get a limited exposure to outpatient neurology only. As an example, a large number of "academic" neurology jobs are actually essentially community jobs at an academic center, where you can work with residents who consult you, but who do not actually rotate with you. Because of this, many places will offer lucrative contracts for people who can handle even the most basic bread-and-butter neurology stuff (headaches and uncomplicated neuropathy as outpatient, altered mental status and uncomplicated stroke as inpatient) because, quite simply, even well-trained IM/FM physicians - let alone APPs - often have zero experience with these things.
Neurology is also complex because patients can often have entirely subjective symptoms (e.g. headache, vertigo, pain), "fake" symptoms (functional neurological disorders, which are way more common than people think), or show up straight-up dead. Inpatient neurology can be a very morbid field - I've been consulted to determine "is the patient alive or dead?" or to inform parents their child's suicide attempt was successful - and that's certainly not a career for everyone.
Neuropsychiatry/Behavioral Neurology becomes a more fleshed out career path
Not happening anytime soon. Behavioral neurology in practice is 95-99% patients with advanced Alzheimer's, iatrogenic cognitive dysfunction (e.g. benzos), or anxious/depressed patients who score 29/30 on MoCAs. This may change someday, but (in my opinion) there are few behavioral cases where the specialist can offer meaningful care beyond that of a general neurologist. For now, it's essentially an academic-only field.
Depending on the type of neuro you go into, it can also lead to a less than stellar call schedule without fantastic pay
This is true only in academics. While community neurologists probably won't make as much as GI specialists or interventional cardiologists, neurologists should expect to be paid a good amount more than their average IM counterparts.