Those are goood suggestions. Yes,if you have a “regular” basement, run the dehumidifiers. If it’s just a crawl space, there are power-vents that can exhaust air periodically.
>>> If it’s new paint, the smell should go away in a couple of days.
>>> If it doesn’t change after a week, there’s something else going on! You may need to hire a home-inspector. There might be a slow water leak behind a wall or something…caused maybe by a bad weather-seal somewhere, or, unlikely, by a plumbing leak.
Thanks,
Faron