Generally everything comes down to money and time. If you have both you will be able to make a comeback.
Search and delivery missions are the best when you are in no shape to fight and your group got so small that you can actually profit from it. Then there are a caravan missions and weaker or slightly weaker camps to raid. I usually make a rule not to fight camps without a quest (unless I attack a stronghold, there is a lot of loot, including gold, to be found), so even after a pyrrhic victory I am capable to hire replacements and buy equipment (unless I have some in store, which I do, after this bug that made me lose stuff all the time).
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