Amazon has opened pre-orders for the seventh volume of the Berserk Manga Deluxe Edition. The collection includes volumes 19, 20 and 21 of the acclaimed series packed into a hardcover book. If you are interested, you can pre-order with the following link from the online retailer:
You can also check out the front cover design of Vol. 7 with the image locates just below this paragraph (a few preview pages can be found in the aforementioned retail listing as well).
According to the product page, the Berserk Manga Deluxe Edition Volume 7 is coming out on March 9, 2021, in the U.S. region.