Serena really hasn’t made the adjustments that will help her to win a slam again. She is almost there.
She really near the end of last year and the start of this year got into the shape she needs to move better on court.
She hasn’t really made the adjustments on serve yet. She needs to really work on placement especially the second serve since she isn’t winning as many free points on serve.
Her return of serve is the most inconsistent. Instead of going for broke all the time and missing them half of the time, she should dial it back especially on key points to get more in play. If your serve isn’t what it once was, then you should at least give yourself a fighting chance by getting more returns in play to break back and not miss half of them by overcooking them.
She is also always going to struggle against players who are match tough and have had say 15 tournaments to fine tune their game to her 3 tournaments. I’m not suggesting a full schedule, but she has to play more to get these parts of her game that are letting her down ironed out.