The Merc

You are pretty high in level and you are looking for some additional ways to make money. Here is a suggestion, sell yourself to the younger players. Many younger players these days have main characters who support them. Get them to pay you to take them through an instance with their group. Are they having trouble with a quest? Offer to do with the quest with them and charge them a fee for your services. Ask for half the price up front and the other half upon completion. This way if someone screws you, at least you have half your fee.

Go to Deadmines, Stockades, even the higher level instances such as Scarlet Monastery and Zul Far'ak would love to have a level 60 tank or healing in their group.

You can scout for your potential clients in the world chat channel of 'Looking for group'. If you see someone desperate to go through one of these instances and you see they have been advertising for a few people for a while, send them a whisper offering your services for a fee. If you have a price in mind, go ahead and tell them ahead of time. Otherwise negotiate something with them and make sure you follow through with your end of the bargain. You will make new friends and they will ask for your help again in the future. They may also tell their friends that you are a good guy to rely on.