I'm sure it depends on the size of your readership, but in my experience these kind of offers are a drop in the bucket compared to the salary of an expert programmer - let alone someone who's had their company acquired.

I also felt that, just like you recognise that the blog boosted the reputation of your startup, that if a blog with my name on it started pushing snake-oil product or making sketchy SEO posts, that would have the reverse effect.

I'd leave it exactly as it is. If you want to pick it up again in a few years time, you can.

If it is useful and you sell it, it will become less useful.

If it is useful and the cost of keeping it online is onerous, perhaps ask for advice here in this thread.

If it isn’t useful, it doesn’t really matter what you do and there’s nothing wrong with taking a willing and informed buyer’s money for something useless.

Good luck.

[edit] I don’t think “wrapping it up” matters much to your readers. People are used to serial creative work dying if for nothing else but Youtube.

Write a wrap up if you want to write a wrap up. It is ok to just move on.