For this Build here, we’ll take the Way of a Thousand Cuts Solar Subclass. Solar is the orange thing that always has something to do with fire.
One of the advantages of this Subclass is that you can set enemies on fire. With your melee ability, you throw a few throwing knives that set enemies on fire. If you now defeat these enemies on fire, you will get your throwing knives back faster.
With the Gamblers Dodge as your Class Ability you can get your throwing knives back when you dodge near enemies. The best way to combine this is to throw your throwing knives, then dodge and throw your throwing knives again. Then you have set as many enemies on fire as possible that you can now defeat with your weapons to get your throwing knives back again and so it goes on and on.
If you are in front of a large horde of enemies and can’t see a way out, the Blade Barrage is a great choice. It is best to jump into the air beforehand to hit as many enemies as possible with the strong exploding knives.
For the grenade, I recommend the Swarm Grenade, especially for beginners, because it is the easiest to use.