Doom Eternal Cultist Base Slayer Gate

Continuing my attempt to beat Doom Eternal on nightmare, this is my struggle to beat the cultist base slayer gate. It starts off pretty rough with two mancubi frollicking around. There's a nice sniping spot in front of where you spawn where you can dart in and out. however there is an explosive barrel there, so getting immunity to barrel explosion is pretty helpful. There is no ballista yet, so I attempted to do weapon switches between super shotgun - rocket and precision bolt - rocket and ice grenades. Still took dozens of tries though