What if a campaign is not spending all of the budget?

It's possible the impression share loss due to rank includes losing out on impressions that the campaign is eligible for but are very broad so you would not want to show for them anyway.

Should I run LinkedIn ads?

It is likely that LinkedIn campaigns to warm leads (aka remarketing) could be a good fit, but LinkedIn campaigns to cold leads is only a good fit for a few narrow industries.

What are conversion action triggers?

Conversion Actions - To be able to track a conversion, we would need a "trigger" for that conversion action.

How to use Local Campaigns to drive traffic to your physical store

If you have a brick and mortar business and you’re running a special offer or a promotion, you can use Google Ads to drive traffic to your local store.