"... shared experiences on mentality and motivational content ...".
I think this is exactly what Steem needs these days. It would be great if you could try to explain some users what could them motivate here aside from rewards )

So, you're gonna share mostly scientific content as I understand. If yes, then you can contribute to these (at least) communities:
@steemstem (https://www.steemstem.io/) (or search on Steemit for SteemSTEM)
and
@stemq (https://www.stemq.io/topics) (or search on Steemit for StemQ)