I think you are trying to say:
I have become even more comfortable speaking English.
Hopefully I am interpreting the thought you are trying to convey correctly.
Hope it helps :)
2019年2月1日
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You could also say...
I am still trying to become more comfortable with speaking English.
2019年2月1日
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Not easy to decipher but let me contribute with my version:
"I have become even more comfortable speaking in the English language"