The store listing is your cheapest acquisition channel, and most teams leave it un-tested for months. ASO compounds: every keyword gap closed and every screenshot variant won permanently lowers your effective CPI across paid and organic alike.
Keyword coverage and page conversion compound: close the gaps competitors exploit, test creatives monthly, and use paid UA to amplify the keywords you already rank for, not to substitute for the organic work. Not doing: chasing raw download volume without fixing conversion first, or running paid UA on keywords with no metadata foundation.