Decide what a conversion is, strictly
A purchase, a submitted enquiry, a call. Not a page view, not a scroll, not 'engagement'. Configure key events for the actions that put money in the till, and be stingy: every soft event you promote to a conversion makes the important numbers harder to see.
The four questions worth opening GA4 for
How many conversions this month versus last? Which channels drove them? Which landing pages do the converting? And where do paying customers actually come from, as opposed to traffic? Traffic reports flatter; conversion source reports inform. That's the difference between analytics and decoration.
Respect attribution's limits
GA4 assigns credit by model, cookies get blocked, and journeys span devices. Treat the numbers as strong evidence, not gospel. Directional truth held consistently beats false precision. If email 'gets no credit' but revenue dips every time you pause it, email works.
Make the machine do the remembering
Build one Looker Studio page with your four numbers and check it monthly on a calendar reminder. Analytics you have to remember to check is analytics you'll abandon by March.