Distance is a ranking factor you cannot optimise away
No amount of content or links makes a business in Long Beach appear reliably to a searcher in Woodland Hills. Proximity is doing most of the work in those results, and it does not negotiate.
Accepting that is the start of a workable plan, because it turns an impossible goal into a set of achievable ones with a clear order to them.
Organic pages reach further than the map does
Standard web results are far less proximity bound than map results, so well-built neighborhood and service pages can pull enquiries from areas your profile will never reach.
That is why the map work and the content work are not alternatives here. In a county this large they cover different parts of the same problem.
Reviews are local, not global
Reviews mentioning specific areas help you appear for searches from those areas, which most businesses never think to ask for.
A simple habit of asking customers to name their neighborhood in a review does more for coverage across Los Angeles than another round of technical tinkering.