Regarding your interests, I've been posting lists of active communities by theme in my Follow Friday thread. I've done Arts and Crafts earlier and just did Science Fiction.
>>I'm still trying to figure out how I'm using this space as opposed to pf and tumblr. <<
Many folks are posting about all different aspects of Dreamwidth, and there are many older ones for Tumblr users. My current one is Twitter Exodus.
The community twitter_refugees has plenty of posts on how to do specific things in Dreamwidth, or what to look for coming from Twitter.
A key difference between DW and Tumbler is that comment threads work much better in DW, so it's easier to have ongoing conversations. Up to you whether that is a thing you wish to do.
Thoughts
>>I'm still trying to figure out how I'm using this space as opposed to pf and tumblr. <<
Many folks are posting about all different aspects of Dreamwidth, and there are many older ones for Tumblr users. My current one is Twitter Exodus.
The community
A key difference between DW and Tumbler is that comment threads work much better in DW, so it's easier to have ongoing conversations. Up to you whether that is a thing you wish to do.