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Deformed leaves may be a sign of pest or disease.
Review the links below.

https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-sticky-leaves.htm

I would wait until all cold danger has passed before trimming up your plant.
Cover the plant during cold spells and uncover when it has warmed up.

You can carefully rebraid a new plant. Just choose three branches that will be suitable and use those. As far as the blooms falling off. This is common indoors, as the humidity if often lower inside. You can help some by spraying the plant with a fine mist of water in the morning, or during hotter afternoons. As far as pruning goes. You will want to remove any branches that intersect, or at least one of them, to keep the airflow through the plant. Basically, you will want to keep the small shrub from getting overcrowded.

If you are transitioning your Hibiscus from indoors to outdoors, always do this gradually and start with a part sun location. Morning sunshine and shelter from the afternoon sun works also.
Your plant may have been sun scorched.
Make sure the plant is adequately watered and continue its transition to full sun.
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm

This can be quite difficult, but with some heavy regenerative maintenance, you can get this thriving again. You will have to wait until the next dormancy to dig this up, but when the time comes, you will dig it up and cut it into as many pieces as you can, and feel safe cutting it into. Plant one or two of these back into the original spot and move, or pot up the others, and give them away. This will help restore it once it is old and gnarled up at the base.