I don't consider VIII a success. Yeah, it had really good opening numbers, because people were hyped to see it, after the cliff hanger of finding Luke at the end of VII, but word of mouth killed revenue after the opening weeks.
Solo flopped because of disappointment in VIII.
TLJ had only 2/3 the box office revenue from VII. That's a huge drop. Plus, the merchandizing revenue for VIII basically stunk. Yes, it made a ton of money, but compared to what it COULD have made, had it been a popular movie (I won't say "good," that's too subjective), it can't be considered anything but a huge financial disappointment for Disney.
So, 2/4 successful Star Wars movies
Production problems on rouge 1 (extensive reshoots, drastic changes to the movie)
Production problems on Solo
New director for IX.
That's 3/5 with production issues.
And, a large percentage of long time Star Wars fans are angry/upset/POd.
For this, they renewed her contract? Dumb.