Heroic assault help

I know this is a long stretch to find 3 additional active players to help with both heroic assault mode. Like all 3 already finished with new game plus and have all characters on level 40. I managed heroic assault staro solo till level 20. After level 20 especially the last mission where I need to defend the laser whilst fighting enemies is so hard doing it solo. And with my current power level I absolutely can't do the Kelvin incident solo. Need to complete both so I have higher gear to win against the villains Showdown plus those three are the only achievements I have left. Hopefully I find 3 teammates who still play this game