Finding Israelite Artifacts in the Sinai Peninsula Between Egypt and Israel

The exodus is the single most mentioned event in all the testament, and that's for a very good reason. It's israel's founding origin story, their national epic. We have bunches of them, multiple independent sources, because the bible is not by one person. So we have multiple independent israelite sources, different authors, over a long period of time,. indicating a widespread tradition was being handed down, that this had occurred what are people who deny the exodus propose as an alternative? How do they explain the way isra as a nation came into existence?