I keep seeing the same birds over and over, and yet some rather common birds have become "nemesis birds". Such as purple finch. I have found the more difficult common redpoll, of birds that show up in winter. The solution is just to go to slightly wooded areas or find bird feeders to follow in winter. It was an easy bird every winter in Wisconsin.
My Lancaster county target list. The 19 and 20 slots are an owl and red shouldered hawk.
Going state wide, a few fairly easy birds appear such as magpie. I have that from Colorado next door in my eBird list.