If your GPT does one simple thing and/or its functionality is obvious from the title, this is not necessary. For example: YouTube Transcript Summarizer, DOC2PDF.
But for more complex functionality, here are my suggestions:
Starter 1: What does this do? How does this work?
95% of the GPTs I check out, I have no idea what they do, even from the GPT title. I say “hi” to start and even then don’t always get an answer as to what the GPT does. That’s one wasted prompt off my usage cap.
Starter 2: Give me 10 questions/requests I can use with this GPT.
Most devs will put 1 or 2 questions/requests/commands as starters. But asking the GPT to generate a list not only gives good variety but is more useful to the user.
Starter 3: How do I contact the developer?
This will probably be a feature in the Store, but ideally all developers should have a way to be contacted. I direct people to my Discord server, specific channels for specific GPTs. At least direct them to your email or your web site. If the user likes your GPT or wants more functionality, that’s a good thing and you want to make that easy for them.