Learn from you! English is also an obstacle for me. I also hope that I can learn about blockchain and cryptocurrency and improve my English at the same time.
Learning about blockchain and cryptocurrency would not help to improve your English, you do not even need to know how to speak English to learn about them, the thing is, the language is needed to communicate on the forum, and if you intend to learn about cryptocurrency on the forum, you'll need to be at least a little bit good in English, so you'll understand what other users post and you'll be able to post your own observations, knowledge and contributions.
Do not also depend only on the forum to improve your English, try taking English lessons online, as well as reading numerous books, this will aid you alot.