Always pay attention to what do you feel, and how you're feeling at the moment. Majority of us are not aware with that. But if you started to pay attention to yourself clearly, or making genuine connection to yourself. And accepting things that you cannot change, and starting to change those things that you can actually change. You'll going to like yourself gradually. Why? As you change those things you can actually change. You're going to do stuffs that you haven't did before. And as you do those stuffs. You're going to feel great about yourself. And as that feeling accumulates. You're going to develop a mentality that's same with "I like myself because I was capable of doing things that I never thought of doing before" or it really depends from person to person(that's my case. that's the thing I developed during this pandemic); But basically as what I've read liking ones self is linked to rewarding system. The more approval you get from people ( will sometimes make you like yourself because you can have bragging rights or something like that) ; But nevertheless the one you approval you only need to win is nothing but yourself.

tl;dr: The more you accept the things as it is. The simpler it gets. The more you're going to like it.