Experiencing a drop off in organic searches

[aidevels]

Hi

A client of mine is experiencing a drop off in organic searches. Impressions and clicks are down but positions remain constant.

Other things to consider:
sitemaps exist
robots.txt is fine
There are no no-follows causing an issue
Seasonality is not the issue
There are no obvious technical issue - site speed is good, html structure is good etc

Any suggestions as to what I can look at next?

Many thanks