best stream times for me are 6pm to 6am eastern time in my experience, but that's just me.

the sketching and shading processes i think are the most fun to watch. once you're basically just tracing (lineart) or coloring (flats) it isn't too entertaining. most of the time streams are just a casual side-thing for folks though. keeping the chat active is pretty important as well. and of course you'll get more viewers if you offer freebies. but you can do the freebies any way you want, be it raffles or just choosing a random person you like.

i need to stop by one of your streams >.<

I would say stream whenever you like though joining one of discord groups and anouncing there might help. Also if you are worried by amount of viewers probably some semblance of schedule might help. Sadly streaming is almost like work if no one ever knows you when you stream they would mostly miss your streams. I know it sounds unfair but it is how it is, usally it is like TV channel you are there for viewers not they are for you. (well at least online livestreaming, has a bit of viewwers for streamer, but not really reliable enough to check weeks along.)
Well I am here mostly for SCD and I enjoy those, but really it is bad idea t ofocus on one content so draw whatever you like.