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Two things: having pages that genuinely answer what people search for, and making it easy for a search engine to find, understand and trust them.
Everything else — technical audits, links, structured data — serves one of those two. If a page does not answer a real query, no amount of the rest will save it.
Search engines are cautious about new and changed pages, and rankings settle over months rather than weeks. A page published today may not reach its eventual position for a quarter.
That is the trade. Paid search is immediate and stops the day you stop paying; organic is slow and compounds. Anyone promising speed is describing something else.
Months, not weeks. Anything promising faster is describing paid search.
Eventually, usually. The cost is front-loaded and the return compounds.
Usually content. Technical work is easier to specify, which is why it is often done first regardless.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.