Unique phenomena as a result of interaction of various quantum orders have been noticed and the research of those phenomena has emerged as a brand new frontier in condensed matter analysis, particularly within the two-dimensional restrict. Right here, we report coexistence of cost density wave (CDW), superconductivity, and nontrivial topology in monolayer 1H-MSe2 (M = Nb, Ta) triggered by momentum-dependent electron-phonon coupling by way of electron doping. At a crucial electron doping focus, new 2×2 CDW phases emerge with nontrivial topology, Dirac cones, and van Hove singularities. Apparently, these 2×2 CDW phases are additionally superconducting. Our findings not solely reveal a route in the direction of realizing nontrivial digital characters by CDW engineering, but in addition present an thrilling platform to modulate completely different quantum states on the confluence of CDW, superconductivity, nontrivial topology, and electron-phonon coupling.