Five audiences, four offers and six creatives look like a thorough testing plan. With a small budget, they may create a collection of inconclusive fragments.
A useful test needs enough relevant exposure and outcomes to inform the decision you want to make. Spreading limited spend across too many variations can leave each with too little evidence.
Choose the most important uncertainty first. Is the offer understandable? Does one message resolve the main objection better? Can you attract a suitable audience at a commercially workable cost?
Agree what would count as enough evidence, what you can afford to learn and when you will review it. There is no universal number of days or clicks that makes every test reliable.
If the data is sparse, report uncertainty rather than declaring a winner from a handful of conversions. Consider a simpler comparison or a smaller decision.
Focus is not the same as certainty. It is choosing a question you have a reasonable chance of answering with the resources you have.
