Why the U.S. Democratic Party's strategy in this midterm election is being evaluated as successful

In this election, we saw the birth of the first Black female governor, the first Native American female governor, and
the first openly gay Senator.
Another record-breaker is Adam Hamilton, who, as a Democrat,
was elected as a Senator in Kansas for the first time in 94 years.
Kansas is famous for being a very conservative and religious area, and Hamilton is a moderate-leaning pastor. This customized nomination strategy tailored to local residents was a major factor in the victory.
The Democratic Party is being evaluated as having had an excellent nomination strategy this time. On the other hand, the Republican Party saw a surge in subpar MAGA and Trump-worshipping candidates.