Verify that your account isn't already on mute. Countless hundreds of thousands of us on Youtube have had our comments put on mute and votes ignored. You can confirm your votes are being seen by setting up an unlisted video of any length or type using an alt account and voting on it with the account in question. Comment votes that are publicly visible as counted will appear using different indications than comments votes that are NOT publicly visible as counted.

You can also repeatedly factory reset any android device, creating a brand-new account with a brand-new email every time you do it. You can then stay logged into Youtube using all of the accounts you create, and toggle between them from a PC browser. That will allow you to confirm that your comments aren't being deleted (by account or by keyword) and also provide backups for when they do put you on mute (and they will eventually put your account on mute because you're a conservative American patriot). This is how much of a communist fucking travesty "You" tube is.