I also have a twitch bot, but it’s with python… And it run on a raspberry, it’s for me the cheaper way to host. And, I haven’t tested, but I believe that the raspberry can run nodeJS… I’ve tested with the raspberry pi 3 and the pi zero, and it works… It’s mean that for 20 or 50 you have a machine to host your bot… It’s depends which raspberry and how much storage you want… But you pay only once 
hope I bring you back to a local machine 