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He’s obsessed with his image, I would bet he spends significant time reading posts about himself on social media. Your best bet, without having a bunch of money to put towards the cause, is to post about him on truth social. However, any message of the nature of your example would be deleted before he had a chance to read it.
If you have some money but not Elon money, the suggestions from others are probably your best bet and less likely to get filtered out if negative. Billboard, swarm of social media bots, etc.
As a W2 worker, as soon as I have all the tax documents I need. The longer you wait the more people get in line in front of you in processing, which can mean significant delays on your refund. If I were a business owner and owed taxes I’d wait as long as possible, so as to make the most use of the money I owe them.