What exactly does one do if teammates aren’t engaging?

Disclaimer: This isn’t a post where I’m complaining about matchmaking.

I am currently trying to learn Doom, which is really why I’m asking this. Most of the time, I don’t really have this specific problem. But sometimes I find that no one on my team is willing to do much of anything other than poke at the enemy from far away. Considering Doom can do next to nothing from range, I’m a little unsure on what I can actually do in this situation?

Usually, when this happens, I will just get blown up if I press forwards or diverge from the team at all and obviously if I stay back with them then nothing happens. Sometimes one of my opponents is stupid and gets out of position, but that’s not really something I can rely on when the opposing team has the advantage. So, what do I do? Try to take high ground? Flank??? Do I just have to switch to a poke tank if that’s the game my team is playing? Again, this isn’t too common, but the situation just feels so helpless when it happens that I can’t help but feel that I’m missing something. Maybe it’s literally just a skill issue.