It seems like you view free speech as "everyone should be provided a platform to speak their mind", more or less. With that view, what you speak of is arguably a problem, sure.
My view of free speech is simply: the government shouldn't arrest you for publishing most things (with only certain mostly-well-defined exceptions). If there are views which are not illegal but which no platform will let you publish, I really don't see the problem. If enough people share those views they can get together and make their own platform. It's not even hard to make a platform anymore, anyone can buy a domain and set up nginx on a raspberry pi.
Freedom from government persecution on the basis of speech is extremely important to me (again, with exceptions). Freedom to publish unsavoury-but-legal content on other people's platforms is completely unimportant to me.
I’ve never understood the “everyone is entitled to have their voice heard by the masses” idea.
It’s never been true before, let alone realistic. It’s only with the past several decades of networked computing that humans have been able to so vastly amplify the reach of an individual or group opinion.
Just because it’s easier than ever to publish speech doesn’t make having one’s speech published any kind of right.