Use the, often searched for, SDE-Interview-and-Prep-Roadmap repository to actively design systems, rather than just reading the solutions.
: Minimizing data movement during server scaling. Alex Lu System Design Interview Pdf
Memorize the four steps to the point of automatic recall. Interviewers want to see a structured approach more than they want a "perfect" architecture. The "process and justification" matters more than any single component being optimal. often searched for
The most valuable takeaway from the PDF/book is not the specific designs of Twitter or Google Drive, but the Xu proposes for solving any problem. He breaks the interview down into four steps: zoom into the most critical bottlenecks.
This is where you showcase your seniority. Once the interviewer agrees with the high-level flow, zoom into the most critical bottlenecks.