I do the same as Mardee. Hold or wait for a living person and then attempt to resolve via chat.
I don't think I'd call myself a Delta fan, but I have better luck with their customer service than I do with other airlines and even other companies.
I had an interesting situation a week ago. I had booked a trip to Italy for January 2025. Into Naples, out of Rome. I got an email that my itinerary had changed but I couldn't find a change, all the flight numbers and times were the same. A few days later I was looking at my Delta trips on the app at bedtime (never do this at bedtime!) I noticed that instead of my 2 hour Amsterdam layover I had a 3 DAY layover. What the heck? Sometimes when a flight is cancelled, the computer seems to come up with the oddest replacements. I called Delta while I played on their website. I asked why this happened and they said they had been dropping some of the KLM codeshares. Anyway, we landed into leaving on the trip two days later and agent gave me a more expensive itinerary and "preferred seats"
I have an upcoming flight to Turkey, home from Venice. Delta changed my return so I'd arrive home 56 minutes later at about 11:15pm. I called customer service and told them I don't like getting home so late, it can be hard to get a Lyft. Delta didn't have to, but they changed the return to eliminate one of my connectings (JFK, ick) and gave me preferred seat at the original price, which had been quite the deal.
Sometimes it just doesn't matter to me why something happened. I just try to improve my situation. Chat sometimes works, typically a live representative works better.