https://simsvip.com/2018/11/15/how-to-complete-the-harvestfest-event-in-the-sims-mobile/
Click on the above link it lists all the quests from 1 - 29.
the remaining quests for you will take longer you need another day to finish from 20, it isnt worth spending real dollars on honestly. I Have a friend playing at exactly the same time as I am, we both are exactly on the exact same stages and do events at the exact same times from start to finish, using same phones, she had some problems with work shifts not showing but with 3 sims she managed to finish the quest not using any cash just a couple cakes because people need to sleep and have a life other than playing a game as a hobby or stress relief. on the otherhand , i had all the glitches. I persisted in restarting my game and phone over and over more than 40 times and I eventually progressed but the errors are still there.
In this game, for one, I found no need to even spend real money for dollars, have your sims work, and infact keep your home to a minamilist living style, dont buy land, no need. no need to finish some quests for a few coins its not worth it. Wait until you have saved alot and leveled up in the game as much as possible. unlock the extra sims. Keep progressing until you unlock items that are purchasable for dollars that end up being for coins. patience and perserverance is what it takes to play such games.
These timed quests add so much unnecessary stress to our lives. EA do not give or plan enough time for these limited time quests as it is, let alone with errors and glitches not doable. Unfair for those who like playing a game for fun. not to add stress.
The quests before this I couldnt complete for the very same reasons as this one. I used up my dollars and cakes etc every bonus I had inorder to try and complete and I couldn't. All these timed events are problematic. 
