i think polkadot and uniswap will be in the top, and also i strongly believe in good and credible dex projects, as for now i'm researching interesting stablecoin exchange - xsigma, they are backed by public company and have good business model
Polkadot has increased up to 75% plus in the last 7 days. This indicates that polkadot have a good chance and also have a high probability of becoming one of the shining altcoins by 2021. polkadot also offer better scaleability (according to them)