Newbie at this. Please help with an older plant

Morning everyone.
I know nothing about these plants. I purchased a beauty about 4 years ago and put it on my deck for the summer. It seemed to love it there and gave me lovely blooms.
In the fall, it was still blooming, so I brought it inside, where it bloomed all winter. I repotted as needed and now I have a huge 4ft plant with flowers.

So what is the problem? It is like a 4ft almost bare tree with flowers. I started to pinch a few ends off last year (hard, because there are buds all over) and it did branch out in that area. But...

Is it too late? Can I trim it down in the spring?

Am I just a bad hibiscus mommy?

Here's a thread about pruning--Robert and Barry are two of our experts around here and they both posted some advice here. Hopefully it gives you what you need!
http://davesgarden.com/community/forums/t/781556/

Thank you so much!!!!

Also, if you have spidermites, your hibs can go bare. If you can find some, spray "Bayers 3 in 1" on the branches. Do this 3 times, one week apart from each other and you should start to see a difference.

Thanks, I will ck that out.

Just wanted to say that I cut the plant back. Way back.
It seems to be doing well, and there are new little leaves coming out all over.
I think it will look nice again by the time it goes back out on the deck this spring.
Thanks again for all the help.

I wanted to update this thread.
I had cut the plant back about 4' (yes 4 feet)

The leaves started popping out all over. Now I have had my first bloom again. It is not as full as it was when young, but sooooo much better. Thanks for all the help.

I will be cutting it again next year. I have a much healthier plant.

Hard to take a shot of the whole plant (against the light of the window) but here it is.
(not sunlight, but glare of snow from yesterday, LOL)