When you switch from a Clicks Strategy to a Conversions Strategy (Smart Bidding), your campaign will go into Learning.
You need to let it rest (aka don’t do changes) for a few days, and then it will start showing again.
The same happens when you increase your budget drastically, but it takes slightly shorter than switching campaign types.
I run Google Ads for Service Businesses, and switch campaigns from Manual CPC to Max Conversions all the time. These have taken from 3 days to over a week. The important thing is to let it rest, otherwise learning resets.