First of all, ask yourself and your team these questions:
- "What do your users need?"
- "What are your users facing?"
- "How can you help your users?"
The research method you choose depends on the purpose of the research.
Additional questions:
"What do we already know?"
"What remains to be discovered?"
"Is this a new feature or an existing feature that we want to improve?"
Here's an illustration presented by the
maze.co service of 12 basic UX research methods: