Short version: deleting the old account permanently breaks contribution attribution for commits that only matched that account, and adding the old address to the new account usually cannot fully repair it when the address is unverifiable.

Why the graph dropped

GitHub attributes commits by email ↔ account linkage at the time it indexes them:

• Commits with 126729392+AsllyZuniga@users.noreply.github.com → current account (these still count).
• Commits with asllyz2610@gmail.com → belonged to the deleted account. After deletion, that binding is gone. Adding the same address on the new account only helps if GitHub can verify it. An address that “no longer exists” stays Unverified, so those commits typically never reattach to the new user.

Rewriting history (git filter-repo / commit rewrite) can change author emails going forward, but you said you don’t want to rewrite — and for shared/public repos that’s the right instinct.

What usually works / doesn’t

Practical path without rewrite

1. If you still control any inbox that appears in those 330 commits, add + verify it on asllyz26.
2. For commits that only used the dead Gmail, accept they stay orphaned unless you rewrite authors (or leave them as historical artifacts).
3. Going forward, set:

   git config --global user.email "126729392+AsllyZuniga@users.noreply.github.com"

   so new work always lands on the current account.

There isn’t a supported “restore deleted account contributions onto a new login” switch. Verification of a live author email is the only non-rewrite lever GitHub exposes.