A job for the boring, a hobby for the deranged: systems administration. Do you like spending 4 hours digging through configs to find out it was typo in a configuration file? How about spending hours of your life, away from work, learning how poorly designed software works and attempting to get it running? Perhaps you want to deal with dipshit software developers that push half baked code that breaks your shit? If you answered yes, then sysadmin is for you!

Get linux machine, whether through a VPS (I like digital ocean and capsul) or a spare machine, and throw some software on it. It's the best way to learn. Start with a personal site. If you don't have your own domain you're a digital peasant. Owning and maintaining your own shit is a moral good, and you should do it in as many aspects of your life as possible. After that use it to self host as much as possible. If you use the google suit of products consider hosting next cloud, if you're one of those weirdos that likes to have smart garbage use home assistant, or whatever. Host what's interesting to you, share it with others, build a userbase, then just fucking abandon them when you lose interest. It's the sysadmin way.