Regex: Delete all the instances of html tag, except the first one

I have several files that looks like this:

<title>用正确方式打开 MyGainer增健肌粉！ - MYPROTEIN™</title>
blah bhla
blah bhla
<title>Home is me</title>
blah bhla
<title>Payton is your name</title>

I want to find a regex that to delete all lines that contains <title>.*</title> except the first line:

My regex is not very good:

FIND: (<title>.*?</title>)(?=(?:<title>|$)) or
(?s-i)\A.*\K<title>(.*?)(.*?</title>)
Replace by: \1

I made a Python code, very good, but I need the regex for this job:
--------------------------

import re

def keep_first_title_tag(extracted_content):
    # Find all `<title>` tags
    title_tags = re.findall(r'<title>(.*?)</title>', extracted_content, re.DOTALL)

    # Keep only the first `<title>` tag
    extracted_content = title_tags[0]

    return extracted_content


extracted_content = """
<title>用正确方式打开 MyGainer增健肌粉！ - MYPROTEIN™</title>
blah bhla
blah bhla
<title>Home is me</title>
blah bhla
<title>Payton is your name</title>
"""

extracted_content = keep_first_title_tag(extracted_content)
print(extracted_content)