Can't install / remove / fix / start NPM on Mac - npm

Could anyone please help me with fixing my NPM installation?
It was working a couple of months ago, but then I tried to launch it recently and nothing is working.
I can't install it, or launch it.
I am very new to all this and any help would be highly appreciated.
npm install throws error:
eugenesoch#Eugenes-iMac ~ % npm install
npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path /Users/eugenesoch/package.json
npm ERR! errno -2
npm ERR! enoent ENOENT: no such file or directory, open '/Users/eugenesoch/package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/eugenesoch/.npm/_logs/2023-02-18T17_42_39_222Z-debug-0.log
npm start throws error:
eugenesoch#Eugenes-iMac ~ % npm start
npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path /Users/eugenesoch/package.json
npm ERR! errno -2
npm ERR! enoent ENOENT: no such file or directory, open '/Users/eugenesoch/package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/eugenesoch/.npm/_logs/2023-02-18T17_44_40_679Z-debug-0.log
eugenesoch#Eugenes-iMac ~ %
I tried installing, tried even using sudo npm install, but nothing worked.
As said, I am quite new to all this and might not know everything, so would really appreciate someone pointing me in the right direction.
Many thanks!

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