The phrase "a better readership" is correct and usable in written English.
It can be used when discussing improvements in the audience or group of readers for a publication, book, or article.
Example: "The author implemented new marketing strategies to attract a better readership for her latest novel."
Alternatives: "an improved audience" or "a more engaged readership".
Reviewer recommends considering publishing this paper in more specialized journal which could provide a better targeted readership in the bioinformatics community.
Flipboard has even added new profile pages that have a better insight into readership and curation activities.
The answers will give us a better idea of our readership and what we can offer you.
Newsweek officials like the economics of their smaller circulation, arguing that their readership delivers a better, more loyal demographic.
After careful deliberations with stakeholders, the editors have decided that a better way to meet the needs of our readership and the field of toxicogenomics is to incorporate the Toxicogenomics section into the monthly issues.
Goth Girl may be marketed at tween girls, but will undoubtedly find a very happy readership among adults; I can't imagine a better book to dispel the January blues.
A better fit, though, might be those magic/vampire/romance series which have enormous and dedicated readerships but have not yet broken out of their core fan groups.
Under new leadership ― Executive Director Lisa Lucas, who comes from the literary magazine Guernica ― the National Book Awards have stated an intention to better reflect a diverse readership. .
The catch is that to get good answers from consumers you need to ask the right kinds of questions; asking the market to predict how many copies a book will sell, which requires predicting how a wide readership will behave, is better than asking the market to predict which manuscript will get a book deal, which requires predicting the decisions of a small number of editors.
Page 1, like The Times, reflects the interests of a readership that is better educated, more curious and more dispersed.
