Ask only what you need
Name, email and message cover most cases. Add one or two fields only when they change the answer.
Offer a topic list
A short list lets you route and tag at the start. Keep it to six options or fewer and include other.
Prompt for the details that help
Add a hint such as what you expected and what happened instead. Optional screenshots are worth the space.
Set expectations on the page
Say when customers will hear back and link the help center first. It cuts the tickets you did not need.
Test it with a real ticket
Submit one yourself, check it arrives with the right topic and look at the confirmation customers see.