I hope your read-throughs and sales continue for weeks. I know when I've downloaded a freebie, it might be weeks before I have time to read it, and if it was good, I'll follow on with other books.
Free runs these days underscore how difficult the market is compared to seven years ago. In 2012, I had two children's/teen books (Horses of the Sun and Horses of the Light) - looking at the historical data, I'd do free days for Sun without using promotional sites, and I can see the free spikes reaching over 7,000, another over 6,000, another over 5,000, and it would make it into the top 50 overall free in all of Amazon. A few weeks back, I paid several promotional sites and had Sun free (I've never been able to get a BookBub feature - nothing I write suits them 'at the moment', but that moment has extended for years), and struggled to make 1,000 downloads - though there are now four books in the series, so there are few sales afterwards, not many, though. *smacks forehead* if only I'd kept writing in 2012 instead of listening to the negative self-talk and stopping. We all need to commit to continue writing from now on, as it's only going to get harder, and we don't want to find ourselves in 2027, looking back and now and realising how much easier it was to market books in 2019.