As a boxer, gold is generally easier than for a non-boxer.

If you have a lot of gold on the server, chances are you have tradeskills to generate more.
If that is the case, you can use the auction house to purchase upgrades, especially for the tank and/or healer.

You can do dailies, to generate gold.
Which will initially go to the tank/healer or other key character on the team.
Eventually, that gold will go into tradeskills to make more gold.

Not exactly on topic of dying in instances.
More a... how to over time die less in instances thanks to gearing, irregardless of the instance itself.