@Andrea4762 As a newish host (I see you have 4 reviews, but I guess you've had more guests than that, who didn't review), I understand that it's frustrating when guests don't leave reviews, as you want to build up reviews on your listing.
But I don't think most hosts would want guests leaving reviews to be a requirement. What you may not be aware of is that hosts sometimes hope the guest won't leave a review, if it was a bad guest they are pretty sure will leave a review full of complaints or lies.
One thing you can do is to send guests a message a few days after they leave, asking them nicely to please take a few minutes to leave a review before the 14 day window is over, that you'd really appreciate it as you're a fairly new host and need reviews on your listing for the benefit of other guests. Don't hound them about it, just one reminder, and they either will or won't.
And when you leave a review for a guest, while that benefits the guest if it's a good review, leaving a review for guests is more a benefit to fellow hosts so they can decide whether to accept a guest or not.