Agents, editors, and readers repeatedly declare that the single most important and elusive thing they look for in writing is voice. The other ubiquitously acknowledged fact is that mastering deep POV is the way to make your writing not only more immersive but also more emotional, evocative, and fun.
There is a sweet spot where a writer masters author voice and nails character voice, and that takes the book from being a good read to being unforgettable. Learn to identify, hone, and manipulate author voice and character voice to deepen POV and understand the connection between the two to make your stories distinctly your own and so memorable that they stick in the readers minds forever and ever.