I’d rather be a hypocrite one out of ten days, than to systematically support animal abuse and murder to feed me - which can be done perfectly fine in harmless ways.
No, the data definitely doesn’t support your position. Going vegan absolutely makes a hell of a lot of difference, even from just one person doing it.
https://thehumaneleague.org.uk/article/how-many-animals-can-you-save-by-going-vegan
Going vegan doesn’t mean you are saving animals. Without your demand for meat they would never get born in the first place. So not eating something that doesn’t get born doesn’t mean you saved them from being eaten. Just imagine how much potato milk I saved from being consumed, by not consuming potato milk.