While it is true that better gear won't make you a better photographer, it is equally true that any photographer is limited by the capabilities of the gear being used.

There's an old saying that has been around photography for a very long time:

Gear doesn't matter.

It's certainly true, but it is only half the truth. The rest of the truth is this:

Gear doesn't matter - until it does.

When the technical capabilities of your gear are not up to the task for the shots you want to capture, then and only then will the gear matter.

When your gear does matter, you'll know. It will matter because the gear you are using will limit you from doing work that you wish to do and that you have the skill and knowledge to pull off. Until you reach that point, the gear you are currently using is perfectly fine for you.

In the end, gear with higher capabilities can certainly help. But a better camera won't make you a better photographer. It will just allow you to use more of the skill, knowledge, and experience you've picked up along the way. Part of that experience and knowledge contributes to the ability to pick the best tool for the job from among the options one has available.

For more, please see: When should I upgrade my camera body? The answer there is just as equally applicable to lenses or entire systems.

I understand what you are saying ~ thank you. The picture I have posted is good but not good enough. The wings of the butterfly are not sharp, nor are the antenna. It also appears to have a little too much contrast that I am unable to edit out.

You'll likely gain more by improving your technique than by buying different gear that will still not give the results you want until you improve your technique. Only when your technique exceeds the limits of the current gear will better gear give you better results. If your current results are at the true limits of that camera/lens, then by all means go for a better lens and camera (in that order). But I bet there are better results that have been shot with the P900 under similar conditions.

In the case of the example photo, the main reason the butterfly is not sharper is because the center of focus was slightly behind the bird. Look how much sharper the thorny vine the bird is perched upon is behind the bird than it is in front of the bird!

That's a technique issue: knowing how to tell the camera to focus on what you want instead of what the camera thinks you want. Your lens was sharp enough, it just wasn't focused on what you wanted.