How can I get this house please help?

me and my fiance are currently selling both our houses and buying a new one. and we found the house of our dreams, it has every feature we dreamt of. it is literally perfect. however we have to sell at least one of our houses before we are able to make an offer, and we don’t know how long that could be. is there anything we can do to keep this house from slipping away. anything we can do to not have it sell before we can buy it? thanks

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