the_content(Read more ...') echoes the stuff straight out so you can’t modify it with str_replace after the fact.
If you wanna use str_replace you need to do something along the lines of
$content = get_the_content( 'Read more ...' );
$content = apply_filters( 'the_content', $content );
$content = str_replace( ']]>', ']]>', $content );
$content = str_replace( 'xxx', 'yyy', $content );
echo $content;
and replace xxx and yyy with the real stuff ofc.
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