But not neccesarily, companies are not people they are not protected by the bill of rights and this is already happening when LE forcibly takeover domains to censor them with cause of course. Also, freedom of speech does not include speech made with thr intent and effect of causing demonstrable harm.
States needs to ratify amendments so having enough state legislatures and laws to support the amendment is the best way. Having someone propose it at the fed level is the easy part.