With effect COVID -19 had made on business, I will advise you look out first time buyers that has money. Buyers with no chain and buyers who have pre-arranged mortgages will be easier to seduce into buy, especially where the seller is not in a chain.
One of the biggest reason buyers don't make offers on homes is because they don't want to offend the sellers. It goes against human nature to offer substantially less than asking price. It can be insulting to the seller and embarrassing for the buyer. Buyers also erroneously believe sellers know when their homes are overpriced, and if they were willing to sell for less, they simply would lower their prices. Maybe you should look into reducing your selling price in as much you will have some gain.
Reducing costs, offering free inspections (you pay for them out of pocket), maybe getting in touch with banks to see what deals they have to offer people.
If you have a super hot lead on a very desirable property, something which a real estate developer could make a lot of money on (usually from deceased owners or an elderly person) in a very desirable location. Once the listing is locked down, immediately call their long-time buyer clients to get in and lock down the deal.
I am not sure what you can do right now. I know the market is going to dip over the next several months so I am sure people will be buying again next year when it is lower.