There is no archaeological evidence against the historicity of an exodus if it was a smaller group who left Egypt. Indeed, significantly, the first biblical mention of the Exodus, the Song of Miriam, which is the oldest text in the Bible, never mentions how many people were involved in the Exodus, and it never speaks of the whole nation of Israel. It just refers to a people, an am, leaving Egypt.
It wasn’t until a much later source of the Exodus—the so-called priestly source, some 400 years later—that the number 603,550 males was added to the story.
https://reformjudaism.org/exodus-not-fiction
Is the Biblical Exodus fact or fiction?
This is a loaded question. Although Biblical scholars and archaeologists argue about various aspects of Israel’s Exodus from Egypt, many of them agree that the Exodus occurred in some form or another.
The question “Did the Exodus happen” then becomes “When did the Exodus happen?” This is another heated question. Although there is much debate, most people settle into two camps: They argue for either a 15th-century B.C.E. or 13th-century B.C.E. date for Israel’s Exodus from Egypt.
https://www.biblicalarchaeology.org/daily/biblical-topics/exodus/exodus-fact-or-fiction/
Sometimes we see what we want to see because it supports our personal beliefs.
And sometimes we ignore what is available to see because it conflicts with our personal beliefs.
If you believe that Moses was a fictional character, and that there was no Exodus, nothing I or anyone here says is likely to convince you otherwise.
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