Search the indicated locations to find a Stardrop Fruit. They will increase your maximum energy by 34 points.

Pay 20,000G to Krobus the merchant in the Sewer. Note: To get the key to Sewer, donate 60 artifacts to the museum.

Catch each type of fish to get a fruit from Willy.

Find every book and item to complete the Museum Collection.

Reach the 100th floor in the mines and look inside the treasure chest.

Earn 2,000 Tokens through fishing, mini-games, or a merchant. You can then purchase a fruit from the merchant at the Stardew Valley Fair.

Get married and get your spouse to 13/12 Hearts. Speak with them in your home to get a fruit.

Present your spouse with a gift on their birthday, then speak with them in your home to get a fruit.

Purchase a Rare Seed for 1,000G from a rare merchant on the northeast edge of Wizard Tower. Plant it during the Fall. Get a Sweet Gem Berry from the seed, travel to Secret Woods, and cut the wood using a steel axe. Then, donate the berry to the statue in the Secret Woods to get a fruit.