I wasted 5 lakhs somewhere and I am regretting now daily , daily i regret, I want to earn that 5 lakhs back by doing some side business, can

Try to earn 50 lakhs even 5 cr why to overthink on 5 LPA life is a bigger game mate

Let go of what has gone, it will never come back. You can earn new 5 lacs, but the lost ones would never come.