If you are happy and confident in your abilities of your current job, then step up and make your voice heard. Do not be stepped on. If thats what you are worried about, then you are just there to be there. I have been with the same company for 22 years. Starting off at the bottom and kept working my way up. It wasnt for what I knew, but my work ethics. Worked hard and always willing to learn. The company I work for, seen this, and always rewarded me. Never asked for a thing. They would offer one job to the next. I was always taking them up on their offers.
Now heres one thing I will tell you about moving on up. ( And Im not talking about the Jeffersons ) More hours, more responsibilities. This took it,s toll on me the past 5 years. Stress and health issues. The company never seen the signs, nor did I, as the plant was running fine. Then one day, it hit and I was not the same person I was. The company did get on board and asked that I keep my position, but needed to step back and give up my work load and hours. They brought new people in to help with this. This was a real hard pill to swallow for me, but it was for the best. I now work a normal 40 hour week, but I still care how things go. Im not a leave it for the next guy kinda guy. Before I was doing 50-60 HPW. My longest stretch with 4 days off was 4 months. That was due to me being concerned, and thinking the plant was mine.
Just something to think about if you really want to be the, go to guy.
Good luck