Help Neede For System Design Preparation

any one who has cracked product base company (for example amazon) interview for sde2 levels (4+yoe)

what did you follow for system design (Ild+hld) preparation what are the resources just enough to crack the interview?

is there any one resource i can blindly rely on (like shreyansh jain or gaurav sen) or should i mix up more than one to study (shreyansh jain, hello interview, gaurav sen, jordan has no life, codekarle, arpit bhiyani)

please suggest that made you crack the interview I'll be starting it from scratch.

my background - working in service based company planning to prepare system design to switch to product base company.

yoe - 4