Is there a way to solve all quintic equations and above by algebraic mean?

No, there is no general solution in radicals for all quintic equations and higher-degree polynomials, as proven by the Abel-Ruffini theorem. While some specific quintic equations can be solved algebraically, most cannot be expressed using a finite number of additions, multiplications, and root extractions. Instead, numerical methods or special functions are often used to find solutions for these higher-degree equations.