S level all fights so you can get extra money and ingredients.
Don't go crazy spending food at Maury's until you clear the map, except for the trial stage and the boss.
When you have gathered all the ingredients you can. Make as high a level Yogurt as you can. 7/8/9. Just make use an empty bottle with milk then pair it with some fruit you grew. Grape/Napple/Lamb Chop etc. They hugely boost alchemy levels. The yogurt can up to double xp gains from Maury. Cha ching. When you start unlocking Ruewort ingredients this will just you a ton of levels.
Also make healing potions and boost them with fruit you grow. Its faster than eating the fruits during battle.
Wait, the yogurt buff works on Maury's cooking? :O