Prior to my being away from BBS for a few months due to hardware issues, the community that i was most active in was SCITE.

There are 2 reasons for this.

The main reason for this is that science and technology is a subject that i am interested in and am fairly knowledgeable about and so it is easy for me to write on.

Although I was not officially a moderator there, I was acting like one. I commented on many of the posts there to add extra information and to correct what I considered as unclear or misleading.

The second reason for me being so active there at that time was because of its owner, MMK@BBS. I like him and consider him as a good friend I made in BBS. 
So I tried hard to support SCITE and help it to grow and eventually get EM.
Even though I was not a moderator I made board promotions for it in METABBS. 

When I came back to BBS after getting a second hand laptop, I was very sad to see that no one was making any posts in SCITE and MMK is no longer around in BBS.

Does anyone have any information on MMK? 
I hope that nothing bad happened to him and that his leaving is just because of disappointment about BBS and thinking that the most active person on SCITE  (me) is no longer interested.

Now that i am back in BBS, I do not mind making posts on SCITE.
My concern is that no one will read my posts there as it currently does not have any traffic at all except me visiting.

Will any of those who used to be in SCITE care to try to reactivate it?

Making posts and commenting there will not earn us anything - It is not in EM and its owner is not around. It will be just because of our interest and enjoyment of the subject.
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I am a member of a lot of boards as writing comes to me naturally and I can write on a diverse range of topics.

The same problem as in SCITE applies to many of those communities.

For example  SHAREIT is a community for investing. Its owner, Rendz@BBS, has said that it is OK if i  as want to make posts about "Global Economy" or on "Precious Metals".
Before I can actually make such posts, SHAREIT has become abandoned like SCITE.

Then there are several other communities that I used to post in.
I am not a moderator in any of those communities.
There is no indication of what will be the revised "Focus Topic" of those communities.
Their owners are also not active in BBS anymore.

Will it be better for me to start my own boards for the various topics that I am interested in?
I will at least have control over the direction of those boards even though getting EM and earning will be practically impossible.