How to feel horny to masturbate?

Let`s Glow • Letsglow

I'm used to masturbate often. And I can have multiple orgasms when I do. It was a good stress reliever. But now, I have zero urge to do it and when I doz it feels very mediocre. Also, the amount of times I can orgasm has gone down a lot. Is there any advice to get my libido up again?