Oh im sorry to hear :( The next update after the jam is gonna make it easier. If you still wanna beat it here's my strategy: Keep in mind that you should make the least moves possible, always take a short route. You should prioritize customers that have little patience left(those who have been waiting the longest) but if on your way there you can make one or two quick deliveries it's worth to do it. Otherwise, wait for after the jam, so i can make that minigame easier xD
Thanks for playing