I'm thinking of giving up my job ! 呢句有咩問題 ?

thinking of 解作"想"咁解, 無太認真考慮
I'm thinking of giving up my job
意思係: 我唸緊遲唔遲工/我有意途遲工

I'm thinking of buying this watch - 我唸緊買唔買呢隻錶/我想買呢隻錶
We're thinking of throwing a party in the office - 我地唸緊想在公司裡搞個party

唔會係thinking to架, 但如果thinking係noun就得
Students are trained to use logical thinking to solve computer problems.
學生們被訓練到用邏輯思考來解決電腦問題

I am thinking of giving up my job.

OR

I am thinking about giving up my job.

Either one is acceptable.

I'm thinking to give up my job ! This does not sound right.
No one would say that in the US.

Maybe you can use

I'm thinking about give up my job!