Get well first.
I don't have your exact Delima, but I have a 40+ year collection of parts that my kids don't care anything about. I had been saving them for this project or that but I am pushing 60 now and realize I don't have that many projects left in me so I need to at least thin the herd. I tried for a time to sell at the Nashville AACA sale in February, but it got to where all people wanted was cheap tools and repro signs. This will be my second year not taking stuff there. The last few years especially there were way too many bottom feeders that wanted to buy at pennies on the dollar. I don't want to hit a home run on every part, but some of the good stuff I have had for over 40 years in some cases and I was not ready to give it away. (As a side note we should all be respectful of the vendors at a swap meet. You have to "give away" a lot of parts to get there and get home and to just sell parts-not to mention cleaning it, loading it, unloading it, setting it up, loading it, unloading it....)
Big stuff is an issue to move. Shipping is hard, packing stuff is hard. I would try to gather up the best big stuff and get a booth at a big show-Hershey or Carlisle type. Try to get decent money for the stuff that is hardest to ship. FB Marketplace is great with no fees but it is only local so it severely limits the buyer pool.
For the past year I have sold a bunch of smaller stuff that would ship for about $25 or less USPS, UPS, or FedEx ground on Ebay. Their shipping rates are very hard to beat. I don't like Ebay fees but the fact remains that they have a worldwide audience and it's hard to beat the exposure. I price my parts just less than the most similar one and I have got decent prices for my parts-even after fees.
Don't make any knee-jerk decisions, get better first.