Express a sense of regret; 'I wish', 'it would have been better if'.
Long explanation:
The ~ばよかった grammar point is used to express a sense of regret or to convey that one wishes something had been done differently. It can be translated as 'I wish' or 'it would have been better if' in English. The formation differs depending on whether it is used with a verb, い-adjective, or な-adjective.