Adam's offensive skills were all effective, quite versatile and could be used no matter how strong he got as he could just pour more energy into the activation of the skills, but that didn't mean that they were the best possible skills for him.
As Adam experienced more and more battles, he noticed that the skills he had weren't up to par when facing strong opponents that were more powerful than him as he couldn't pour energy into them that surpassed his own cultivation rank.
Because of that, against opponents that were more powerful than him, his skills were not of much use and were very limited, especially against beasts that had tough bodies.
Over time Adam began using those skills less and less and the only offensive skill that he had that might be effective against such a powerful beast was the Air Palm Strike Skill, but that would require him to get close to the beast and land a direct hit with his palm, which is easier said than done.