In any market, but particularly a hot market, most sellers won’t consider an offer contingent on the sale of a home that is not even in escrow because it may never sell and then they’d miss out on other offers that are more sure to close. You’re better off getting a “bridge loan” to buy your nex home.
In order to get a seller to consider an offer contingent on the sale of a home you would have to offer at least $50,000 more than the highest offer. If the seller accepts your offer, now you are a motivated seller so you’d have to price your home at least $50,000 below the market to sell it fast. So, buying with a contingency will cost you AT LEAST $100,000 more than selling your home first or getting a bridge loan ($50,000 more on the home you purchase plus $50,000 less on the home you sell). 
Yes, the bridge loan is expensive but it’s not going to cost you anywhere near $100,000+.