Hey, its cool a model
to fix your dagger in the channel animation, just have to move it over into the hand in your animations key frames. I took a look and there is not many keyframes for it so shouldnt be to tedious to do, also a little tip, you dont really need the keyframes which appear blue you can push delete on them and make it less keyframes to go through, the green ones however should be kept and those ones will need to be adjusted. i am assuming you using reteras studio, in the edit tab, you can push 'F' to switch to the animations, select your animation and then get your one bone that you had assigned your dagger to and drag it over in each frame lol hope that helps with that.
Got any questions about it dont hesitate to ask lol also if you have trouble getting it, i can adjust it for you, but should make the attempt to learn yourself first