How can I determine the right target CPA?

I have been running my HVAC campaign for 90 days, starting with Maximize Clicks. I’ve been getting daily conversions which is great. Now, if I want to switch the bid strategy to Maximize Conversions, how can I determine the right target CPA?

Google recommended 140 AED as a target CPA, but I think that’s too high. When I reviewed the conversion cost over the past 90 days, the highest was 53 AED, and the average was around 35 AED.

What should I do when switching to Maximize Conversions?

Should I set the tCPA without limits for a couple of weeks or use the CPA based on my historical data?

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