After successfully opening all his five Primordial Veins, each granting him several new abilities and chances both during and outside a fierce battle in the future Nash decided on something he didn't do until now.
Practice!
Yes, decided to train and hone his newly acquired skills and abilities! And why was that? Well, there were several reasons for that question.
First and foremost, which made the biggest sense and perhaps didn't actually need any explanation was that it was essential for him to practice. As the saying went, practice makes the master hence without practice one can't become perfect.
Secondly, if he had to bring up a solid reason why he decided the way he did was because he was... weak.
Of course, when one talked about being weak it didn't mean his overall strength was weak or his abilities as he could singlehandedly deal with numerous beings of the same Rank and even a few above. No, what the meaning weak here meant was his proficiency over his skills.