System design interview resources

I'm almost done with grokking the system design interview from educative.io. What other resources should I use? I know of system design primer on github and I have the book "Designing Data Intensive Applications" but reading all of it seems like overkill. Are there any other resources like Grokking that have system design sample questions and answers/discussions? I have 3 yoe and will be interviewing for Uber L4. Can anyone comment on the expectations around system design for Uber L4?