Switch Suggestions

I have completed my bond in current company after 2 yrs. I'm planning to switch the company but the issue is system design round. I have 1.5 yrs of experience in front end and 5 months full stack training. My target is product based companies. I am comfortable with DSA . Suggest me the preparation strategy for system design rounds. Most companies either having full stack or backend positions. So they are very less openings for frontend. Should I also start preperation for Backend system design too.?