Conversion rate optimisation gets sold as a science of micro-tests, but on paid traffic the wins almost always come from a small number of structural fixes you can ship in a week. We keep a working checklist of the patterns that have moved CVR by double digits across more than a hundred audits — message-match between ad and hero, evidence stacking above the fold, friction in the form, and the quiet damage done by ambiguous CTAs. None of it is glamorous, all of it compounds.