DOT is not stablecoin. Stablecoin is a token that doesn't change its price so it is stable (USDT, USDC, DAI), but DOT is a native token of Polkadot blockchain and it changes its price within time.
Personally I am optimistic about its price, I believe that it will grow in the long-term as a lot of good projects that develop the Web3 appear on it and I think that the ecosystem of Polkadot will be really huge.