Value of using multiple social media platforms

I am the social media person for an amateur sporting organisation.
SEMrush

It is voluntary work and quite a time consuming doing a good job with (1) Facebook to get it right and I also duplicate some of these posts in my club notes section of a (2) local newspaper and we also have an extensive (3) Email Newsletter.

Although we have an extensive following, only a few people click on LIKE and/or SHARE, I assume that the same would happen for (4) Twitter and (5) Instagram.

Even though it’s a well-supported sports club, only a few people ever bother to LIKE and SHARE a very diverse range of well-presented posts.

I am always a little confused as to the value of the effort required to repeat the same posts that I have created on Facebook and duplicate them onto other platforms such as:

Facebook
Local Newspaper
Emailed Newsletter
Instagram
twitter.

Thank you for your thoughts.