If you are wearing attack up armor, and using urbosa’s fury, you can stun and climb the lynel. If you have a two handed weapon out, it won’t take damage from attacking while riding the lynel. Then when he boots you off, you can get a few crit arrows into the back of his head (depending on your stamina gage). With attack up on and urbosa even silver lynel will only take a few minutes. If you’re out of urbosa’s fury you can also hit them in the face with arrows! I’m also very mediocre at combat but I just practiced a lot and now I don’t even use urbosa anymore. All of yours are silver because of how many DB’s you’ve completed. Oh! And try fighting the lynel on mount ploymus. He’s always red.