go for it!

Go for it! (used to encourage someone to do something they’re thinking of doing.) — Давай! (= пробуй, действуй)

Example 1: Should I apply for this job? – Go for it!.

Example 2: I wonder if I should ask him out – Go for it!

Example 3: I feel like giving up my job. – Go for it!

cf.
go for sth