'Feel Free' Considered Harmful
Sometimes people will solicit input or questions or reviews using the words "feel free". For example, a podcaster might say, "feel free to leave us a review and a five star rating."[1] This is a terrible phrase. Whenever you say "feel free" I hear "don't bother". The phrase is so passive. I don't know exactly why the phrase grates on me so much but it does.
Here's a substitute phrase that is better: "Please". "Feel free" is used when somebody is making a request. That somebody wants something from you but does not want to seem pushy, so they say "feel free". Instead, they should be direct: "Please leave us a review and a five star rating".
If you want to emphasize that this is optional, then you might say: "If you are able, please leave us a review and a five star rating," or "Although not mandatory, we would really appreciate it if you left us a review and a five star rating."
If you want to be emotionally manipulative, then "If you really loved us, you would leave us a review and a five star rating" probably serves the purpose.
[1] Let's not discuss how dishonest the appeals for five-star reviews are. You want us to post an evaluation of your podcast on some service, but you are demanding we give you perfect marks?