The items for digging are very cheap though last time I checked, but with only one Knuffel I see how you're not getting enough.

Try to gain FP for more? The event lasts until the 24th, I am sure you can work something out.
Sugars are not that hard though - you just need to check pages multiple times and check your timer well. I've found three now and need to wait two minutes for my fourth.
They do not respawn all at once.
Though as for flour, I can actually see the problem there, I am not very sociable myself (though since the Halloween event I've been a bit more active). However, if you find the right Hangout thread, you can often go with the flow. Follow the subjects they bring up. That is what I often do, since I am not a great conversation
starter.
If you don't like topics with more than 1,000 pages like I do, I found
this nice little thread. Come talk to us.