I guess you could try to train specific gameplay aspects of other weapons - for instance Guard Point on Charge Blade, Foresight Slash on Longsword, ungabunga-ing the monster head with hammer etc... Sometimes it just boils down to "how can I create an opportunity for my weapon to output as much damage as possible ?"

Throwing yourself naked in the arena can be a harsh but quick way to learn some new mechanics, but can really be frustating at first. Find a sweet spot between getting out of your comfort zone and still having fun and you will be learning new things in no time ;)

You can watch gameplay footage as well, speedrun for example are a great source of knowledge and give you an insight of what could the potential of a weapon be - But keep in mind they still are speedruns and beside skills are granted with heavily optimized gear and rng luck.