When it comes to grinding, there is no real best spot to grind because the profit heavily relies on your play style, gear, whether you are in a party or not, and how crowded the place is. With that said, there are a few places that do stand out and definitely deserve to be mentioned.
Pre lvl. 50, Sounil camp will net you the most amount of money, with around 6 million an hour due to its insane mob density. From lvl. 50-55, either Helms or Abandoned Iron Mine will give you a nice profit -- up to 10 million an hour.
Past lvl. 56, things get a bit different. All spots will net you a lot of silver, and though Sausan Garrison and Pirate Island are the most consistent in terms of silver because they don't rely on lucky drops.
However, the single best spot to grind is the Gyfin Rhasia Temple. It will net you a bare minimum of 15 million, up to 45 million silver each if you’re lucky. However, the place has some outrageous gear requirements and needs to be ground in a full party to succeed. If you want to try and grind here, be prepared; it is tough, but very rewarding and a lot of fun.
Guide for grinding at the Gyfin Rhasia Temple
The best tip I can give you when it comes to grinding in the late game is just to pick a spot you like. Grinding isn’t AFK like most other methods for making silver, so you might as well make the best out of it. Grinding in a party can help with this as well. Grouping up and talking to each other is a nice way to make the grinding more enjoyable, but also can increase your profit and EXP gain when you're not clearing all that efficiently. So wherever you grind, just make sure you enjoy it. Don't make it a chore because that is not what this game is meant to be.
I hope these methods will help you achieve your next goal in Black Desert Online, and increase your bank significantly. For more Black Desert Online guides, stay tuned to GameSkinny!