Promo for Goodreads giveaway?

I have a live giveaway, running through Sunday, Oct 29. (here, if you’d like to see: https://www.goodreads.com/book/show/197063682-becoming-lottie-moon)

360+ people have entered to win 100 of the Kindle copies I’m giving away, which I’m pleased with, but I’d like more people to enter. I shared it on my author Instagram, but I haven’t shared the giveaway info on my other social media or with my newsletter subscribers because my goal with the Goodreads giveaway is to find new readers, so I don’t need to let current readers know, right? If anyone else has run a successful giveaway on Goodreads, I’d love to hear if and how you promoted it in your circles of influence. Right now, I’m just letting Goodreads do the heavy lifting :) It’s only been 3 days. Should I keep letting Goodreads do its thing and hope for more people to enter?