Self-love isn't something you should be doing to manifest. It's something that should be the most important aspect in general, if you don't love yourself then nobody else can love you.
Its things that make you feel happy, healthy such as making sure you get enough sleep, drinking enough water. eating the right foods, doing things that make you smile, looking after yourself and a plethora of other acts. Essentially anything that makes you feel good for the sake of feeling good.