"Burn the candle both ends" is a phrase commonly used to describe someone who is working or living excessively and likely to experience burnout soon. If you want to convey the same message, you can use various other phrases that mean the same thing. "Spread oneself too thin," "stretch oneself too thin," "work oneself to the bone," and "overwork oneself" are synonyms that can work in the same context. "Push oneself too hard," "exert oneself excessively," and "overextend oneself" are other phrases that mean the same thing. Ultimately, the choice of which one to use will depend on the context, the tone, and personal preference.