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Enhancement of Curie temperature ($T_\mathrm{C}$) of two-dimensional (2D)magnets is immensely desirable for room temperature spintronic applications.Fe$_{5}$GeTe$_{2}$ is an exceptional van der Waals metallic ferromagnet due toits tunable physical properties and relatively higher $T_\mathrm{C}$ than other2D magnets. Using density functional theory combined with dynamical mean fieldtheory and Monte Carlo simulations, we show that the $T_\mathrm{C}$ ofFe$_{5}$GeTe$_{2}$ monolayer can increase well-above room temperature bysubstitutional doping with Ni. It is found that two specific sublattices (Fe1and Fe4) are the first and second most energetically preferred occupation sitesfor Ni. $T_\mathrm{C}$ of Fe$_{5-\delta}$Ni$_{\delta}$GeTe$_{2}$ increases upto $\sim$ 400 K at $\delta \sim$20\%. Exchange interactions between particularFe5-Fe4 pairs play a dominating role in tuning the transition temperature,influenced by doping-induced structural distortions. Finally, we highlight theeffect of dynamical electron correlation in site-specific electronic structureand quasi-particle mass of Fe-$d$ orbitals with varying Ni dopi

Microscopic Insights for Beyond Room-Temperature Ferromagnetism in Ni doped Two-Dimensional Fe$_5$GeTe$_2$