For a local business this outranks everything else you could do.
Your business name, address and phone number must be identical everywhere they appear — your site, your profile, directories, your invoices.
A single page listing every service ranks for nothing.
None of this is glamorous and all of it is loadbearing.
Mentions from local sources — a trade association, a local news item, a supplier directory.
Nobody controls the ranking, and a guarantee is a sign of either ignorance or a plan to game something that will later be penalised.
For a business selling in one district, most SEO advice is irrelevant. The handful of things that genuinely decide local ranking, in order, and what to ignore.