I feel this sometimes it's just an endless cycle of giving your all and getting nothing in return

Honestly the best thing that I do is take a break from people. And I don't mean when you're at work, or school or whatever, but when you have free time, take ot for yourself for a while. Don't go out, don't go on social media, just let ot be you and you alone. And you don't have to do it for a long time, just for a week or even a couple of days and see of it helps