What is it meant by Lifting yourself up from your bootstraps?

"Lifting yourself up by your bootstraps" is an idiomatic expression that refers to achieving success through one's own efforts, hard work, and determination, without relying on external help. The phrase suggests that individuals can overcome challenges and improve their circumstances through personal initiative and resilience. It often emphasizes self-reliance and the belief that one can change their situation through perseverance. However, it can also be critiqued for overlooking systemic barriers that may impede some people's ability to succeed.