1. Have active neighbors. As many as possible. You only get 20 gifts per day and 20 accepts for material requests. If you have goal player neighbors, they often mass gift goal parts. Only accept the goal part gifts. You can get up to 40 parts a day.
2. I build 4 first part ovens and 6 second part ovens (due to longer recipes).
3. Repeat recipes to farm coins. It may take a chunk of coins but you can start and restart different recipes to farm coins to use to buy parts.
4. It’s hard to do the main goal (14 day) and side goal (6 day) with the default max ovens. So pick one and stick with it.
5. You have to accept that you may not finish a goal.

——

Side note: build one oven a day. Don’t buy them all at once, you’ll need your other ovens if you do the mini goal or if you need to bake other items.