Self-love is self-awareness. Look at yourself and reflect, ask yourself who you are. Become comfortable in the discomfort that comes with reflection.
There are parts of yourself that are toxic, there are parts that need improving, there are parts that are growing. Grow and realize what you need to do to become better.
In return, you will become more of yourself, you will feel more peace, you will be able to feel empathy and help others in their self-development process too.
Put work into yourself.