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I have made up the sentences below.

(1) After I attended the workshop last week, I decided that accounting wasn't right job for me. (you use "wasn't" to match the form of the verbs before it.)

(2) After I attended the workshop last week, I decided that accounting isn't right job for me. (you use "isn't" because it is still not a good fit for you.)

My non-native English speaking friends think (1) is correct and (2) is wrong.

I think (2) is also right because your comment on accounting not being the right job is true up to this moment, and it's not expected to change anytime soon.

Do you think (2) is correct? Thank you very much.

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Both are ok, but the sentence isn't quite natural.

The most natural tense in the final clause is governed somewhat by the main verb.

After attending the workshop last week, I decided that accounting wasn't right job for me.
In the workshop last week, I realized that accounting isn't right job for me.