Are there any non-IG places (online or app) that you like to visit or post your photography?
I am still a big fan of Flickr. I also enjoy posting photos on my website.
How active is Flickr nowadays?
Fairly active, as far as I can tell. The folks at Smugmug have been working on revitalizing it. That seems to have injected some life into Flickr. As a photographer, I enjoy it far more than Instagram.
I have only shared any of my photos here. But when you asked the question, the first place that jumped to my mind was https://web.500px.com/ although I’ve never actually used it. (Funny how a brain works.)