Other than this, with showings: make sure the lawn is manicured, all lights are on while touring, window shades open, and maybe a handout with a short list of neighborhood amenities could be helpful!

What part of proceeds to suspended losses offset?

In order for me to drop it to something that would be affordable to the middle of the pack I'd be looking at several hundred in loss per month.

Automatically add money to an S&P 500 ETF into your Roth at predetermined periods spread throughout the year to surf off both gains and losses.

This lets you run any report you could imagine, including a Profit & Loss by Class (property) so pretty handy.  

I received a landlord dwelling quote from Travelers for Coverage A - dwelling for $223,600 plus 25% of additional replacement cost coverage which puts the total at $279,500, plus $28k for furnishings and $70k for loss of use.I understand I wouldn’t need to purchase the land in a rebuild, but $280k seems low for a cabin worth $520k, not to mention the risk of inflation continuing to drive costs higher for building costs and labor.

Last year was easy to claim a loss and maximize my tax benefits because I only collected a half month of rent and spent far more than that getting the place going.

Setting the rent, in this case, would be a bit of a challenge, as a fair rent would find some sort of balance between the risk of a loss if the STR experiences low occupancy and the reward of making more profit should the occupancy be high.  

You have a couple of long-term rentals with mortgages, and they already show a net loss with the "slow" depreciation.

If the market bobbles and your ARV you calculated in the beginning isn't possible at the time of sale and there is a loss, they are likely going to be experiencing a percentage of that loss as well.