A few trading and finance terms first :
In a long position, you believe the asset you are holding will increase in value against another asset. If you buy an asset at $1, because you believe it will go to $2, you are long that asset against USD. To have a long position, you buy the asset.
Int a short position, you believe the asset will decrease in value against another asset. The asset is currently at $1, you believe it will go to $0.50, you are short that asset against USD. To have a short position, you borrow the asset, and sell it.
A stop loss protects you from losses should the price decrease. If you are long an asset, and the asset is $1 currently, you could put a stop loss at $0.75, if the price increases the stop loss isn’t triggered. If the price decreases to $0.75, the asset is sold. Stop losses protect your position.
If you are long an asset, you have the asset. You can use this asset for its intended purposes, but only where this asset can be used. Your collateral (value you think will decrease) is locked up. If you buy an asset at $1, you have the asset, but you don’t have the $1. That $1 is your collateral
If you are long an asset, you would like to use the asset as collateral, so you can lend another asset. If you are long asset A, you could use it as collateral to borrow $1. This allows you liquidity against your long position.
An easy solution consist to buy "Sell / Short" on Bitforex (Perpetual account) : they offer 12 contracts (BTC/USD, ETH/USD, LTC/USD.....). Most of the time the value of cryptocurrencies are tied to the value of Bitcoin, because Bitcoin is often considered as a “reserve currency”. The highs and lows of its price often influence the value of other coins.
For 100USD invested in staking, you have to calculate the number of Sell/Short (for example BTC/USD) you have to buy to protect your 100USD. Sometimes you can make some profit by inverting the position (Buy/Long) when the BTC value sink. But don't forget: the first goal is to protect your ass(et).