It's hard to suggest some streamers I know because we don't live in the same county.
It doesn't matter if which country you live but as long as that streamer is speaking or able to speak English language then that is acceptable or maybe it's possible to do the stream in their native language? So that many audiences is going to be reached out, as we know that it's easy for others to understand their mother tongue.
It will also depend on your budget because as far as I know, streamers that promotes a gambling platform asks for some talent fee first before they do the job
You mean depending on their agreement. Budget is always there but some casinos will only agree to pay the promoter once the job is done as they only want to make sure that the job is done correctly according to their taste. This is fine for me if I am the streamer but as long as I know that the gambling site is highly trusted.