Use the Tome of Training!

Training allows you to slightly increase the basic stats of your character.
With its Breath and Strength EXP +50% effect, [Event] Tome of Training should help train your character!

• Strength
When your Strength level increases, your character's carrying weight limit permanently increases.

If your character is carrying trade items, they will carry a pack, and moving in this state will grant Strength EXP proportional to the distance moved.

You can also gain Strength EXP by using seaweed, a marine gathering item or as rewards from certain quests.

• Breath
When your Breath level increases, your character's stamina permanently increases.

You can gain Breath EXP by walking or running without a mount. Additionally, you can use agar, a marine gathering item, or receive Breath EXP as rewards from certain quests.

[TIP!]
Interact with "Solare's Warrior" in the Hall of Honor in the Battle Arena to consume 20 Energy and receive the "Blessing of a Great Knight," which grants a +10% Breath EXP effect for 10 hours.