Am in second winter. Have donated about 100 things to museum, literally never ever turned up a book on beach so can't donate to library, have activated all solar nodes in ocean and seen Agung and his sister, and cleared both mines to 40, but can't get a C rating. Completed Sam's bronze produce quest and upgraded everything but fruit trees. Never seen garlic, watermelon or fairy rose seeds or forageables in any season, neither Sam nor Ben has new winter seeds for me, so can't finish winter offering (tried different-quality hack, nothing happened.) Several eligible love interests are at 5 hearts, several non-romanceable ones between 1 and 3 hearts. Game will not let me cook.
Is there anything left to do except try to keep making friends? Will that unlock this ginseng forest I read about or fossils or any other new content? Does decorating your farm help advance things?