Moz released their local search ranking factors study results for 2017. They do these studies every two years by survey the smartest local SEOs out there. You can view the full results here if you have not seen them already.
How have things changed in the past two years? Here is a neat chart that shows the percentage change. No surprise here that social signals had the biggest decline...
Again, this survey is filled with tons of information. It is just a survey, so it doesn't mean the results are accurate. These are just best guesses from local SEO experts. But still, these are experts and I would value their opinions.
Forum discussion at Local Search Forums.
This post was scheduled to go live today but was written earlier - I am currently offline today.