Plugins
Three plugins, each free and finished as it stands. Each has a paid tier from $3 a month billed yearly. Nothing here is a trial and nothing expires.
The three of them
Attribution Tracker
Records where every visitor came from and attaches it to the form they submit, so a lead in your inbox arrives with its campaign on it.
Free version
Pro $4 a month
Dynamic Content
Shows a different phone number, WhatsApp number or call to action depending on how the visitor arrived, so you can tell which campaign generated the call.
Free version
Pro $4 a month
Responsive Focal Point
Lets an editor pick the part of an image that must never be cropped out, and set a different point per breakpoint when one is not enough.
Free version
Pro $3 a month
All three are free to try properly
Not a trial and not a demo. Install one, use it on a real site, and decide from there.