This isn't specific to just flying, but always challenge yourself. If you aren't trying to get better, you won't. It is just that simple.

It amazes me the amount of people who just don't put any effort to anything in their lives, and yet have the gall to whine and moan about not being able to get ahead.

I don't believe the type of aircraft you fly makes you "better." There are certainly more challenging aircraft than others, but that applies in both the turbine and piston world. You will need the experience in the piston aircraft before you ever move up, so don't deny that opportunity to master your base set of skills that will transfer later into any aircraft you fly.

Also, be flexible in your "master plan," you might have opportunities right infront of you that could be overlooked just because they didn't fit the exact direction you thought you needed to go. You might surprise yourself and find something you love doing.