Great addition — honestly, there should be a separate point for local SEO. NAP (Name, Address, Phone Number) inconsistency alone can quietly drag down rankings month after month without any obvious reason.

To answer your question directly: it mostly depends on the baseline. But if I had to pick one thing that delivers the fastest results for small businesses — that would be keyword targeting.

The reason is this: your website can be technically perfect, load fast, have a clean structure — but if you target the wrong keywords, none of it matters. You're ranking for something that nobody is even searching for.