Collecting and Turning in 20 Island Tokens Total: Great Skill Point Potion Lost Ark Gold - It might be best to follow a guide for the easiest-to-clear Islands, as some of the Islands in Lost Ark are unbearably tedious to get the Island Soul for. Giant's Heart #4: Skill Point Potion - Random Drop from Shushire's Tarsilla Field Boss. Giant Heart #6: Skill Point Potion - Exchanged for on Atlas Island for 33,000 Pirate Coins Giant Heart #10: Skill Point Potion - Clearing the 35th Floor of the Shadespire Tower Giant Heart #12: Skill Point Potion - Completing the "With A Light Heart" Quest on Shadowmoon Market Island - This Quest has a lot of pre-requisites before it will appear, so keep that in mind.
Tokens are rewarded on each continent for clearing 100 percent of its Adventure Tome Gathering 2 Omnium Stars: Greater Skill Point Potion - These aren't even available to collect until after Punika's main story. Gathering 6 Omnium Stars: Greater Skill Point Potion - Very difficult to do and not something to try and rush.
Last up are the Skill Point Potions that are given as rewards for meeting certain reputation thresholds for specific Una's Task. Every completion of a specific Una's Task in Lost Ark give 10 reputation points towards its associated reputation, with the max for each reputation level being different depending on the quest. All of this is just to say that there's only one Una's Task that rewards this, and it's the Una's Tasks related to Nineveh's Island, Whispering Islet.
To unlock this Una's Task, players first have to complete "The New Us" Lost Ark Gold for sale, and then it appears in their list of available Tasks. This reward takes 10 separate days to obtain, and involves three separate Una's Tasks called Whispering Minuet, Whispering Resonance, and Whispering Harmony. It's a good idea to keep an eye out for any future Una's Tasks with Skill Point Rewards, as there is a lot more content on the horizon for Lost Ark, and this surely won't be the only daily task that has this reward.