In the long term, having a provider like Cloudflare that stores your content on geographically diverse servers to speed delivery also makes it so that only a small percentage of your traffic is actually served by your origin server. But of course, that does cost money.

I normally get about 600 "hits" per month of organic traffic ? that's with no advertising sending anyone to my landing sites on my website. In the first 5 days of May I've had over 1700 "unknown" hits on my site. Meaning the site hasn't recognised the IP addresses of the sources. The data is a mess of letters and numbers, and nothing jumps off the page like "facebook" did last time.
It's a mystery, and an annoying one.
And so far, Bookbub can't recognise my book. Waiting for them to resolve THAT.

Update, looks like Facebook is doing that weird thing again and "pinging" my website with every impression, causing the perception of an enormous amount of traffic and my website provider wanting to charge me more bandwidth! So I've paused the ads to check if they're the culprit, and I might as well dabble with Bookbub in the meantime.

Now booking for June!

You'd have to check TOS, but you can tag ads. I remember learning about a way to do that through AMS and you can get stats from that. I think that can be done through Facebook. Not sure if you can add any type of link to BB. I have affiliates and I never added them to BB for fear of problems from the non-website source.

I've never bothered with BB ads. It's not very scientific, but my measurements are simply whether I get an increase in sales or not.  That's how I measure it.

Sci-fi & Fantasy Newsletter Builder @ StoryOrigin
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Up to 5 books per author! This is for all subgenres of sci-fi, paranormal, and fantasy except erotica. No nekkid man chests for this one. All mailing list sizes welcome, but I do expect you to share with your list.