If the market is flooded with dirt and concrete guys, then don't play in that market. A CWI certification is more like having a diploma from a jr college. Useful, but there are a lot of people that have one. I know few people in the inspection trade that have only one certification. I have a pocket full of them. But it keeps me from pushing buggies at WalMart.
If you are going to stay in the structural side of the industry, you need to get the NACE CIP Level 2 with the Bridge endorsement. A CWI with NACE and ability to do bridge work can stay busy. You live in a area with a large refinery petrochemical industry. Work a couple of years getting to know the ins and outs of that industry. Ask questions of the job and project inspectors. Build a network of contacts. Do this while working for someone else. Be willing to change jobs in a instant for one that will give you experience in areas you are limited in. A inspector willing to take 3-5 years to grow, learn and network will be set after 5 years. You will always have to hustle. And sometime you will wind up burning a bridge or two.
But there is a reason some people can demand $4-6K a week as inspectors. But you need a plan and be willing to do what is required and take the time to do it. And if you expect to be in that $4-6 range, you better be ready for what you are going to give up to be there. Cause you are going to be on the road living in motels, a travel trailer hell even a tent, if that is what it takes.
How many of the dirt and concrete guys with a CWI are willing to do that?
Few.
That is why the companies can set the wages low because there are a lot of people willing to settle for what the companies pay so they do not have to sleep in motels, traveling and being away from home and family.