commands not found on zsh

It’s evident that you’ve managed to mess up your PATH variable. (Your current PATH doesn’t contain any location where common utilities are located.)

Try:

PATH=/bin:/usr/bin:/usr/local/bin:${PATH}
export PATH

Alternatively, for “resetting” zsh, specify the complete path to the shell:

exec /bin/zsh

or

exec /usr/bin/zsh

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