Help Needed 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 (lld+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