last working day

Today was thelast working day, so I was in good spirits all day.
Because of it So, we had a small party in our office.

In At the party,there was a person who helped me with my project.
He was from another company and left our office as of today because our contract had expired.

He has been (engaged in different works at many companies/involved in various projects at other companies).
He is a CG designer. He said there were many people who were on a higher levels outside my company and that I shouldn't only compare myself with someone else other people only within my company. ['someone else' is fine, but it sounds like you don't know who they are]

So now, I've began thinking that I might have to take account of working at other companies to improve my career.

But a rash decision of resignation may be risky...I'm on the fence....

By the way, the game I used to be involved in is starting service just now.
The name of it is "Gundam online", which is an online TPS where more than a hundred people can play and fight.