A recent post on twitter by @RealBasedBlonde may have a way to impact the shadowbanning. You can read the thread to bulk-block ALL major advertisers on twitter - something like 465! The instructions are easy - and if twitter stops shadowbanning, it's also easy to reverse; also, if you want to stop for a personal reason, it's easy to stop. Instructions on her thread: https://twitter.com/RealBasedBlonde/status/1030085263110955008