Making the Proton Mail App Free
While a similar suggestion exists, it is undetailed and specific to windows. I am talking of all of the app versions of proton mail (macOS, windows, Linux) to become free. (Proton Mail bridge would not become free, it is its own thing.)
The reason for this is because it simply doesn’t offer any features. If anything it seems to lag behind the website slightly but also autoupdate other parts from the website causing ui clashing and the app itself is seemingly overall an electron contain version of the progressive web app. Therefore I propose that the app becomes free in order to improve user experience and be honest with customers, there are no features being missed out upon in the app.

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GreenStar commented
Everything the App can do the website can too, equally if not better.