What do you usually do to stay motivated when people expect you to be the source of encouragement?

Lately I’ve been thinking about how tough it can be to always act as the “motivator” in a group. I’ve noticed that friends often come to me for advice or just a pep talk, and while I’m glad to help, it sometimes leaves me completely drained. One evening after work, I just wanted to sit quietly and have someone else keep the energy up, but instead I ended up trying to cheer up others again. It’s like people assume you never run out of strength, which is far from true. I wonder, how do you personally manage to keep your own drive alive while also being the person everyone leans on for positivity?