M1に変わってhomebrewがinstallできない

homebrewは以前より使っていましたが、M!に変わって使えなくなってしまったため、こちらのコマンドでhomebrewのインストールを開始すると

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

永遠に以下が出てきてしまい、インストールができません。

You must: brew install git
==> Installing git
You must: brew install git
==> Installing git
You must: brew install git
==> Installing git
You must: brew install git
==> Installing git
You must: brew install git
==> Installing git
You must: brew install git

brew doctorで診断すると一部以下のように出てきます、、

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  node
  python@3.8

Warning: You are using macOS 11.2.
We do not provide support for this pre-release version.
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub,
Discourse, Twitter or IRC. You are responsible for resolving any issues you
experience while you are running this pre-release version.


Warning: Could not find an SDK that supports macOS 11.2.
You may have have an outdated or incompatible CLT.
Homebrew found the following SDKs in the CLT install:
  10.14
  10.15

Please update CLT or uninstall it if no updates are available.