Who can promote my English-speaking crypto related Telegram channel?
You may get some offers here for promotion since you made this post but be aware that majority of the people trying to sell you subscribers are actually ripping you off because they add in bot users who inflate the subscriber count but dont actually do anything useful for the channel. But I guess you are looking forward to that only because you said "channel" and not group.
A better way of doing it is to start a giveaway in this forum in the "Services" section where you can reward those who join the channel and remain there for sometime to ensure the count for a month or so and then giveaways every few months to make sure they dont leave the channel. That is how you grow a channel in an organic manner.
Very good advice