  We perform asymptotic analysis for the Euler--Riesz system posed in either
$\mathbb{T}^d$ or $\mathbb{R}^d$ in the high-force regime and establish a
quantified relaxation limit result from the Euler--Riesz system to the
fractional porous medium equation. We provide a unified approach for asymptotic
analysis regardless of the presence of pressure, based on the modulated energy
estimates, the Wasserstein distance of order $2$, and the bounded Lipschitz
distance.
