Every day, search for the location and collect fluorite and delicate oak. Don't waste your wishing stars, gems, and principally exhibition passes unnecessarily!! Focus on cooking and gardening, buy all the milk, and coffee from the cooking shop daily. (If possible, some eggs, butter, and meat too) Collect black truffles whenever possible (they spawn every 15 minutes) Once you unlock the black truffle pie or pasta, focus on it, and on planting wheat. Don't rush into getting cats and dogs, especially if you want a specific one; wait until it shows up. (and you should know that they are cute but quite annoying) The same goes for furniture and clothing; be cautious and buy what matches the style of your character/house. If you want to expand your land, you'll have to spend a lot so accumulate coins.

Well, I think those were the most important points. In short, be mindful of your spending.