Sink no longer draining after cleaning trap
Most likely there is a clog further on, possibly aggravated when you poked into the pipe further on and compacted stuff down there.
One other possibility, the vent pipe attached to the drain well behond the traps of all the fixtures is clogged between there and the upper end above your roof.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.