SoloQ - What to do when 2 dead?

When solo queing, if your 2 teammates die is there any point even trying to fight? So far in this scenario I've either tried to get the revive or just play really passive til they respawn. But then they just run in and die again, even if Im with them. I play Medium / Defib / Heal so try and not be first in.

Solo Q is pretty trash for getting good teammates and I just feel like I cant win games 1v3 the whole time.

Im wondering if its also worth just 3rd partying a different teamfight and trying to finish off / wipe the last member of a team.