What can you do to increase your products/services prices without loss of profitable business?

There are two ways for this. First is to intriduce lean management and implement it so yiu can get rid of waste and the processes become smart.

2nd focus on value addition in the offering so custmer feel comfortable to pay and there is no price war

There can't be a perfect solution without analyzing the specific business details but one general advice will be-

Make value enhancement clear to the customer. The customers should feel that they are getting something extra for the increased price.