The Democrats have a variety of identities; the party is a coalition of women, minorities, young people, liberals, and some workers. The GOP, on the other hand, is a party of a single identity–old and white. When it wakes up in the morning and looks in the mirror, it sees Donald Trump.
This makes it difficult for the younger and more vigorous Ron DeSantis to gain any traction with the electorate; an apparent advantage is really a disadvantage for him. It also means the rest of the candidates in a surprisingly diverse field have very little chance of success.