There are certain islands that you can go to for grinding stats - 1st sea : Ice Island; 2nd sea : Udon Prison; 3rd sea: Shattered Future. I recommend using these islands to grind stats. Also use the Ope v2/Sing+ Sukuna or Dark v2, if you can dark gives 2X more stats which is absolutely insane and use the title "prodigy" if you can, it give 1,5x the most.
Stats
Statistics, often abbreviated as stats, are way of measuring the player's combat ability. Statistics are divided into seven categories, which are useful for different skills and require different methods to improve: Strength, Stamina, Defence, Sword, Gun, Haki and Fruit. The maximum level for each stat is 12,000
- The Strength statistic determines the damage dealt on enemies when fighting style and support style are used. To increase this stat, the player must use a fighting style, such as the default Combat, Fish-Man Karate or Electro. You can gain Strength using the support style.
- The Stamina bar affects how many skills can be used back-to-back. The stamina statistic affects the maximum amount of stamina the player can have at a time. To train this ability, players must drain their stamina by using various skills. Skills that cost more stamina will therefore allow them to level up faster. Every level reached adds an extra 25 stamina points to the stamina bar.
- The Defence statistic affects the maximum amount of health the player can have. To train this ability, players must take damage from other enemies or, if they have a Devil Fruit, take damage in the ocean. More taken damage equal more faster level up. Every level reached adds an extra 50 health points to the health bar.
- The Sword statistic affects the damage dealt by swords, whether it be Suzaku, Kitetsu or Mugenji. To train this ability, players must use various skills involving the sword.
- The Gun statistic affects the damage dealt by guns. To train this ability, players must use various skills involving the gun.
- The Haki statistic affects the power increase when Armament Haki is applied and also unlocks Observation Haki. To train this statistic, players must perform skills with Haki applied to their sword or fighting style (Some Devil Fruit skills also is improved by Haki,and Therefore helps train this statistic.) . They can also use the other two types of Haki.
- The Fruit statistic affects the strength of the player's Devil Fruit powers. It can be trained by using skills from the Devil Fruit. Therefore, the player cannot train this statistic if they have not already acquired and eaten a Devil Fruit.
- AFK Training fa o L sem auto click
The away-from-keyboard training, often referred to as the AFK Training, is a space where players can increase their statistics without having to be at the screen battling mobs. The player can teleport to the training zone by using a button near the top of the screen. Every fifty seconds, a small amount will be added to the statistics bar and also 10 gems and 3 tokens will be given. Therefore, training manually is the more efficient choice.
AFK training hub
If you do a quest you will also gain stats on everything
Accessories
A few Accessories buff your statistics. For example, the Straw Hat boosts you STR by 60, DEF by 45, and STM by 25.
Stats farming
To farm stats easy use Tiny-Task.