You might read an article in Birder's World or Bird Watcher's Digest or WildBird magazine about some fantastic birding spot in another part of the country. There have been over 910 birds species seen in the U.S. and Canada. And your yard list probably has not yet reached 50. I'm glad you asked. The key to seeing more birds is to visit many different bird habitats.
Birds carve out their own niche in nature.
You will have to go to burning deserts, buggy mud flats, cold mountains and deep woods to see more birds. Or you could start with the beautiful State Park an hour drive from your house. You will take an all-day trip out into the ocean to look for Shearwaters. When it is completely out of control, you will be birding in Kenya, Papua New Guinea and the Amazon jungle. Your world list tops 1,000.