Your Draft
The reply is four to six sentencesBrevity reads as confidence. Length reads as defensiveness.
No sentence begins with "but" or "however"These words signal a counter-argument even when you try to hide one.
There is one forward-looking sentence"Going forward I will..." shows growth. It is the most reassuring line in any reply.
The reply ends warmly with no parting shotThe last sentence is about wishing them well, not about being right.
Final Check
You have run it through an AI tool or shown it to someone you trustAsk the AI to flag any phrase that could read as defensive or accusatory.
You are posting for future readers, not to have the last wordYour reply is a marketing pitch to your next homeowner. Not an argument with the last one.
You have checked for typos and formattingRun it through a spellchecker. A professional reply has perfect grammar. One typo undermines everything above it.