Services for posting press releases, which are now effective? And how effective are they in general?

Question

Content

Hello.
Please tell me some effective services for posting press releases, you are interested in:
1) Free
2) Paid
3) Effective ones from which people will definitely switch
Also I would like to know from experienced webmasters who regularly post or posted press releases, how effective they are whether it is worth publishing unique content and uploading it to free services.
My subject: tourism, construction