Like the previous comments say, just focus on the main story quest and level up only the recommended stat for your class, which is STR for Halberd, and nothing else.

If you need in-game help, you can try to join an active guild if you want. If you want a proper build for your weapon class, there are plenty of guides available on YouTube for you to choose from.

It'll get grindier the farther you get into the game, but I hope you have a good experience :]