Buyer won’t answer messages for a custom order

6 days ago, I had a customer query about ordering 3 keyrings from me + an additional custom one. After assuring them that I’d be more than happy to do that, they finally ordered 3 days ago.

The same day, I sent them a photo of the initial design for approval. They have not responded. I like in the UK and they’re from California, so I’ve tried to be patient to account for the timezone difference. I sent a reminder message for approval 1 day ago, and have still not received a response.

Since my initial dispatch date was tomorrow by the latest, I’ve decided to bump this up by a few days to hopefully give them enough time to respond. In the dispatch date change message, I included a note about waiting for approval and to check their Etsy messages, but I’m worried they still won’t respond.

What is the most logical thing to do if they do not respond in time? Do I cancel just the custom and only send the non-custom keyrings? Or do I cancel the order all together? I’m a new seller and I don’t want to risk my stats over this.