Credit Risk Management Strategy in Fixed-Income Portfolios

As a senior portfolio manager at a large investment firm, you are tasked with conducting an ongoing analysis of credit risk across your fixed-income portfolio. Recently, the firm was informed that a significant portion of its allocations is concentrated in investment-grade bonds from a specific sector. Given the current economic indicators that signal potential stress in that sector, you must decide which risk management strategy would be the most effective to mitigate credit risk exposure. Which of the following strategies should you prioritize to enhance the credit risk profile of the portfolio?