How to lower CPC for keywords that have no competitor ads but high CPC bids, also with high buying intent?

Hi everyone, Campaign: Search Keyword Planner Competition: Low Keyword Planner Estimated Bid: $20 Actual Ads when searching on Google: No Ads So this is quite a unique situation for me, those keywords have no competitor ads shown in the targeted area(checked with Google location changer). I guess, Google applied the Ad Rank Threshold to decide a high bid for that keyword, because those search terms belong to a new trend and are highly commercially valued. I did a total of $100 test to be statistically significant for the CPC results, but it doesn't look to be less than $1.5. On the other hand, the conversion rate is around 5-7%. But with my AOV being $64, I need to lower my CPC to keep a positive ROAS. I can do some product-wise changes such as bumping the price up or adding some upsell to the order. But what about keeping the offer the same and doing some revising on advertisement? I would like to hear your thoughts about the advertising-side. What would be your next move in that situation? Thank you for your suggestions!