Yes i think it's always a bit of luck with timing and content. A photo could get a nice vote if a Whale who likes photos sees it at 25 minutes - but how can you know the whale is there :)
I have tried the scattergun approach, and found that @utopian-io will support my IT background, and @dtube will occasionally support a vlog. But i was lucky to create a curation league which I do each week and that has really helped with engagement. And sometimes I'll do a travel post, or a Steemit update, and that just about fills my week.
I hope that helps!?
I can see many bloggers here are being successful with this approach. Utopian also helped me a lot, I think I'll be resuming there very soon.
And thanks :)
Yes, never change a winning formula! :D