Good landing page Good ctr Excellent ad 0 calls What is wrong with this campaign??

In last 7 days these are results in 3 diffrent niches and while ctr is great they get 0-3 calls in this period, how is that posible, how to make it diffrent, is it because of landing page experience if yes how should a landing page look, i have made a lot of them with simple texts and call to action buttons, should i make it more professional is that the reason why they are not converting?

What does these parameters mean?

My name is Jovan and i started my google ads journey two months ago, right now i have 10+ clients and to some i have given really good results, but to others i have not. My intention is to learn more so i can provide more ROI to my clients, as of now i am working only in my country but my goal is to work worldwide in future but for that i need to be sure that my service is top notch! This is a quick summary of why i enroled in this group, i already saw that there is a lot o valuable information in group so i am really grateful that i have a chance to be in this environment! 😁

What's the best # of Keywords to have for a Search Campaign Adgroup