Look, I'm all for candidates of color and I think the Democratic party should be more representative in its leadership of its actual electorate, but the candidates of color we had just did not manage to resonate with people and I don't ran particularly great campaigns this cycle. Harris wasn't that great of a candidate, Booker never really got his campaign going in any meaningful direction and didn't really play to his strengths like he could have, Patrick launched a bid entirely too late to achieve anything without any real support to begin with, Castro didn't really do anything and largely got dropped when his attacks on Biden landed horribly in the debate, and Yang held out the longest with a solid conversation on UBI emerging, but without really the infrastructure or political experience to keep going. They all played varying degrees of centrist left of the main centrist candidates, but that lane has not worked out for anyone since the polarized points of Bernie's progressive ideologies and Biden/Buttigieg's hardline centrism tend to pull most of the electorate.
I think we would have seen a lot more success from a candidate of color running a campaign as left leaning as Bernie and Warren to be honest, but there were no candidates of color pushing that lane. And I don't really think any of the centrist candidates were ever really going to be out-centrist Biden or overcome his name recognition as Obama's VP.
Now it's totally fair to point out that candidates of color have to work twice as hard to get half the recognition and that it's not fair to have the frontrunners of elections be those solely with larger name recognition that have also gained that recognition through white privilege. Those are absolutely legitimate points and that continues to be indicative of the systemic racism still playing a role in the US and the Democratic electorate as a whole that needs to be addressed. But I also think the candidates of color we had this cycle also really struggled to run better campaigns that appealed to voters and their own ideological stances.