Make the current commit the only (initial) commit in a Git repository?

Here’s the brute-force approach. It also removes the configuration of the repository.

Note: This does NOT work if the repository has submodules! If you are using submodules, you should use e.g. interactive rebase

Step 1: remove all history (Make sure you have a backup, this cannot be reverted)

cat .git/config  # note <github-uri>
rm -rf .git

Step 2: reconstruct the Git repo with only the current content

Before step 2 if you have not set up init.defaultBranch configuration then, please do it via git config --global init.defaultBranch <branch-name> you may choose main as <branch-name> in the current example

git init
git add .
git commit -m "Initial commit"

Step 3: push to GitHub.

git remote add origin <github-uri>
git push -u --force origin main