To answer your question, let's equate risk with aggressive or conservative.
Your asset allocation should be aggressive enough to allow you to sleep comfortably at night and not be worried about the stock market or what interest rates are doing. That seems overly simplistic, but your real answer is to earn as high a return as possible while being comfortable with your choices. Without knowing the offerings available to you in your plan, your age, and what a 15% loss in your account would mean to you, there's nop real way to say "do this" or "invest this way".
Many of the 401(k) providers I've worked with provide a risk profile questionaire tuned to the plan offerings. By answering 10 to 15 questions, you can generate a recommended asset allocation based on the funds available from your employer. There are also numerous websites that can help with this decision, but they will not tailoered to the specifics of your available funds.
Hope this has given you some ideas.
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