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Moving a Croton to a new location can cause leaf drop in the plant.

If this is not the case there can be a few different reasons.

Here is a link to help you pinpoint the cause.

https://www.gardeningknowhow.com/houseplants/croton/croton-dropping-leaves.htm

OH GEEZ, why don't the pix I selected come through? This is crazy.

I am going to recommend that you prune your croton (at least the most elongated wayward branches - I see three such branches in your photo - the ones that are bending over) in order to regain the bushier look that you desire. Pruning will encourage new growth lower down on the stem.

For more information on the care of croton plants, please visit the following link:
https://www.gardeningknowhow.com/houseplants/croton/care-croton-plants.htm

For good color in your Croton, they need good nutrition. They are acid loving tropical plants. Feeding them 3 times a year with an acid producing fertilizer will help.
Proper sunlight, bright but not direct and consistently moist soil.

https://www.gardeningknowhow.com/houseplants/croton/care-croton-plants.htm

It is best not to let plants sit in the water that runs out the bottom. The water should be promptly emptied out of the saucer under the pot, or you should water in the sink so that this is not necesary. If the plant sits in the water, the soil may stay too wet, or salts can build up in the soil and eventually damage the plant.

Plant mites are not harmful to humans, so don't worry about them getting on you. Taking the plant outside and hosing it down to wash the mites off is a good control method. Here are some other ways to get rid of the mites:

https://www.gardeningknowhow.com/plant-problems/pests/insects/common-mites-affecting-plants.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm