If you can't find the meaning and fun of your work gradually, you may want to reflect on whether you have tied the work and external rewards too tightly to forget your original intention and purpose. The happiness of work comes from the affirmation and desire of the heart. Carefully discover the fun and value of the work itself, and make learning and work become interesting things to "do for yourself".
Do you think about learning skills every day, but you are exhausted after work and have no strength to continue learning. In this state, you need to learn energy management.