Finding a place to legally get '7 Wishes' can be a bit of a quest, depending on where you are. My understanding is that it's originally a Thai novel that's been translated, so availability varies. I checked the major platforms—Amazon Kindle, Apple Books, Google Play Books—and found the English translation there for purchase. It's usually listed under the author's name, Sansinlee. You might also want to look on the MEB app; I've seen some Thai-translated titles pop up there occasionally.
For a free legal option, your local library's digital service is worth a shot, though it's hit or miss. I couldn't find it on mine, but a friend in a bigger city had it available through Hoopla. The translation reads smoothly, and having it on a legit platform means you're supporting the people who made it, which feels good, especially for a story that relies so much on its cultural roots. I'd skip the random websites offering PDFs; the formatting is always broken and you miss out on any official updates or corrected editions. Starting with a Kindle sample chapter is how I decided to buy it.