Well, if it is a cost issue, there are a lot of ways to get your meat on without paying the high prices for grass fed steaks.
Look into what is called “cow pooling” in your area. It gets you a quantity discount.
Also make friends with your local butcher. Many items such as organ meats, soup bones, tongue, “oxtail”, etc. are often available for very low prices. Just making your own bone broth could be a great addition to your diet.
And definitely eat those eggs and fish. Canned sardines are a great keto protein source that is also budget friendly.
It is theoretically possible to stay veg (including eggs and dairy) and keto but vegan would be very hard. You would have to rely heavily on coconut, mac-nuts, and avocado.
Not only that but skipping the meat is not good for your overall health. There is a reason why vegans need regular B12 injections. Unless it is a religious conviction, at least include seafood.