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I have written some sentences below.

(1a) Before eight years ago, I travelled to Europe. (my sentence)

(2a) Since six years ago, I have been working for this company. (my sentence)

My friends' revisions below.

(1b) Sometime before eight years ago, I travelled to Europe.

(2b) Sometime since six years ago, I have been working for this company.

I don't know why my sentences are wrong, and my friends think theirs are correct. What is your opinion? Thank you very much.

(1a) --> More than eight years ago, I travelled to Europe.

(2a) --> I have been working for this company for six years.