What should I do?

[SC-FTW]

I'm playing a match on Peekaboo (76th turn =.=) and my opponent has me locked down with (as far as I can see) 2 soldiers, a heavy, a runner and 3 bombshells, and I only control a couple tile "layers" around my base because of the bombshells' splash damage. I have no idea what to do now to break out. I currently have a soldier, a heavy, a bombshell, a medic and a sniper. All of his and my units are buffed. None of my units can reach him and attack except runners which will just cost me wits and die uselessly. If anyone has any ideas on how to get out of this situation it would be much appreciated.

Another of my matches is on Long Nine (turn 53) and after turn 30 or so we both turtled really hard and are now in entrenched positions. I have 9 buffed soldiers walling off my side of the map with 2 snipers, 2 medics and 2 bombshells as support. As far as I can see he has 2 heavies, at least 5 soldiers, at least 3 runners and at least 4 snipers. He has been saving up wits for the past 2 turns (or he's been misclicking a lot). Should I go in and attack or keep defending and waiting to see what will happen?

Thanks in advance.