For the moment, this is a feature we’d love to add in, but it’s a difficult one.
The Google implementation, for example, is based upon a very large volume of past queries, so in order for this to work at the moment for us we’d have to use a 3rd party API. Doing this would come with a fair few issues of its own.
We have been reviewing our priorities again, and notably after the large survey over the last few months. It’s not a feature that many have requested there and through other channels, so other developments have taken priority. Of course, if it was a quick-win and without the issues Josh mentioned above, it could be different.
Since I originally posted, Mojeek began testing a “related queries” feature.
That is based on LLM generated suggestions. And, I’m guessing it would be the basis for search suggestions if Mojeek offers that feature in the future.
You can read more, and test the feature by manually adding a custom cookie to your browser: