In a Google Ads smart campaign, usually, conversions will be low. In a smart campaign, the selected keywords are based on "themes" rather that being based on specific keywords, although the interface will make it look like it is based on specific keywords. In a smart campaign, one cannot add negative keywords !!!
Smart campaign means no control over where your ads will appear, ads can get shown in Google Search Network, Google Display Network and Google Search, Maps, YouTube, Gmail, and on Google partner websites !!! Not all of these are ideal for conversions and Google partner websites are notorious for bot types of clicks (on ads).
Also, there is no search term report for smart campaign.
Therefore, it is better to pause the smart campaign and create a campaign in expert mode, so that all the possible avaliable campaign setup options can be used towards getting better or more conversions and lesser ad costs.