Years ago I added the following lines to my .env file:
#Go one directory over in same subdir system/
g () {
cd ../$1
}
#Go TWO directories up and over
gg () {
cd ../../$1
}
Added Bonus: with the "." argument,, these commands just jump up a level or two. They don't save a lot of keystrokes individually, but considering how often I perform those operations, they add up quickly.