I keep seeing "Export your Quicken data to a file in .csv format", but there is no obvious way to do that from Quicken; CSV is not one of the export format choices. I started the Trial for QBOL, but can't see an obvious way to get my Quicken Data into it.
Explore to open your Quicken data file on trial license of Quicken 2020, install the trial licene of QuickBooks Pro 2020 to import the file, then migrate it to QB Online. Make sure to click the Buy button to get the discounted price for up to 6 months. If you purchase from the trial account, you have to pay the regular price.