SEO AUDIT — flat traffic. Diagnose the cause before prescribing, because
"flat" has three very different root causes and opposite fixes.

FIRST: WHICH KIND OF FLAT?
  Pull Search Console, 16 months, and read the shape:
    Impressions flat, position flat  → you've maxed your current
                                        content. Need new pages.
    Impressions up, clicks flat      → ranking but not compelling.
                                        Title/meta problem, not content.
    Impressions down, position down  → losing ground. Technical or a
                                        core update hit you.
  This one read tells you which section below to actually work.

TECHNICAL — the show-stoppers only
  • Indexation: pages indexed vs. pages that should be. A big gap here
    caps everything else no matter how good the content.
  • Core Web Vitals: LCP, CLS. A failing score is a ranking suppressor.
  • Mobile render: it's mobile-first indexed; check the mobile view,
    not desktop.

THE FASTEST WIN — striking distance
  Filter GSC to positions 11–20. These pages already rank, already have
  authority, and need a push, not a rewrite. Refresh the on-page target
  and internal links to these first. This is where flat traffic moves
  in weeks, not quarters.

ON-PAGE
  Title tags matching search intent (not just the keyword), one H1,
  internal links from your strong pages to your striking-distance ones.

CONTENT GAPS
  Terms competitors rank for and you don't. Not "write more" — write
  the specific missing pages the SERP rewards.

PRIORITIZED OUTPUT
  Week 1   striking-distance refreshes (fastest movement)
  Week 2   fix any indexation/CWV show-stopper
  Month 2  content gaps (slowest, highest ceiling)

Give me Search Console access or the impressions-vs-clicks trend and
I'll tell you which of the three "flats" you have.