Is it one group of people or more, eg young people and pensioners?
Different groups could be interested in different aspects for different reasons. They are likely to read different publications.
If so, you will need to tailor press releases for each type of publication to emphasise what interests individual groups.
If you don’t know who you want to reach, you won’t know what they’re looking for and so won’t necessarily be providing what they want. It’s also a waste of resources to send press releases anywhere as they are unlikely to get published without a clear focus.
Perhaps your audience is small and limited to a specific sector served by just a few publications. Or else it could be much bigger and include large numbers of consumers who read different publications according to their age, interests, etc.
Knowing your audience enables you to target your resources more effectively and gives your press release a bigger chance of success.