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Palms, like almost all trees, should always be kept buried up to the same level they've been growing at in the soil. Mounding up sand or other materials around the base of a palm higher than the root-shoot interface will likely kill it.

The exception is if the palm was originally planted too shallowly or if the soil has eroded away, so that the place where the roots meet the trunk is now above the soil surface. This article will help you decide whether your palm can benefit from more soil or sand around its base:
http://edis.ifas.ufl.edu/ep001

Otherwise, staking should help. If necessary and if the tree is small enough to handle, you can replant it in a more stable way.

Watering a newly planted Bismark Palm depends on if it has leaves or they have been removed.
If your palm has it's leaves it is recommended that you water it 20 to 25 gallons 3 times a week for 4 weeks.
Water is twice a week in the next month, and then once a week in the following month.
Stakes are generally removed in the 2nd or 3rd year.
If the palms leaves were removed, the water amount is doubled to 50 gallons.

https://www.gardeningknowhow.com/ornamental/trees/bismarck-palm/growing-bismarck-palms.htm

Typically they grow 1 to 2 feet per year.

https://www.gardeningknowhow.com/ornamental/trees/bismarck-palm/growing-bismarck-palms.htm

A healthy palm may survive loss of all it's fronds. Give the palm time to recover.
So sorry for this tragedy.

https://www.gardeningknowhow.com/ornamental/trees/palms-trees/palm-tree-dropping-fronds.htm

These can act strange sometimes. The roots are VERY sensitive to disturbance. Even if you only had high winds for a short period, it could have still damaged the roots. It would be hard to correct if this is the case. You will just have to carefully watch the tree. Sometimes they recover, and sometimes they don't. They can take as much as 3 or 4 months to show symptoms of root trauma.

Here is a collection of articles on this palm that you may find helpful: https://www.gardeningknowhow.com/ornamental/trees/bismarck-palm/

Ultimately it may end up with severe damage to the palm, but there are a few things to do to help it out.

Potassium silicate will help to strengthen up the trunk quite a bit, but I recommend using it at half strength. Funny things start to happen when you use most silica products at full strength, depending on the plant. It affects the pH of the soil zone, which will lead to a potassium deficiency. These free silica will attach to as many potassium as it can.

To counteract this, you may use iron sulfate to lower the pH swing.