Beginner linux projects

Hi all

Looking for some advice on levelling up my linux skills. I'm currently working in a level 1 support role in a mainly linux environment. I do basic troubleshooting and have automated a fair amount of manual tasks in the past. I'm not a whiz kid at scripting by any means but I would like to improve my skills to the point where I'd like one day down the line to become a linux system administrator.

I have a raspberry pi at home and I'm wondering is there any projects you guys could suggest that would help me towards this goal in the real world. Thanks a lot in advance.