We all make mistake We all make mistake

'We all make mistakes' -- plural :)

I am a constant change job person. I am a constant change job person.

Correct but 'I am a constantly changing jobs person' or 'I am a person who constantly changes job' sound more natural :)

The longest job I have been working was around 5 years. The longest job I have been working was around 5 years.

'The longest job I have worked was around 5 years' :)

Most other jobs that I’ve worked will be less than a year. Most other jobs that I’ve worked will be less than a year.

'Most other jobs that I've worked were less than a year' :)

One of reason will be my low competence, I am just good enough. One of reason will be my low competence, I am just good enough.

'One of the reasons was my low competence' :)

One other main reason was the big mistake I created. One other main reason was the big mistake I created.

'Another' works better here but not incorrect! :)

So, in two jobs I make the same mistake and cause the boss fired me. So, in two jobs I make the same mistake and cause the boss fired me.

'...I made the same mistake and caused the boss to fire me' :)

The boss tries to blame me with a loud voice. The boss tries to blame me with a loud voice.

'The boss tried to blame me...'

I argue back and won the flight. I argue back and won the flight.

'I argued back...' :)

The result was I fired at new year eve and Chinese New Year eve. The result was I fired at new year eve and Chinese New Year eve.

'The result was that I got fired on New Years Eve and Chinese New Years Eve' :)

Hey, this is my ruth story. Hey, this is my ruth story.

'This is my true story' :)