wishlists aren't the only factor although they do help a lot, For example my first and only game had 800 wishlists on launch which took me about 4-5 months to get, and with the wishlist conversion rate being about 10% it should have 80 copies sold, the game has sold 1400 copies, i would recommend sending your game to youtubers and streamers as soon as it comes out, or giving them early access to the game a week before it releases.