Advise needed for a loved one.

I never thought I’d be writing something like this, but I could really use some advice and support.
My dad has struggled with meth addiction for many years. There have been times when he got clean, and every time I thought things were finally going to be okay, he relapsed again. It’s been an emotional roller coaster for over 20 years, and I’m exhausted.
I love my dad, but I don’t know what the right thing to do is anymore. Has anyone else had a parent or close family member who struggled with addiction? How did you cope? Did you set boundaries, or did you stay involved? What helped you protect your own peace while still caring about them?I’m not looking for judgment—just honest advice from people who have been through something similar. Thank you to anyone willing to share your experience. He just turned 60. He had been clean for almost three years, had his own place, and a really well-paying job. I truly believed things were finally turning around.The hardest part is that my kids, nieces, and nephews barely know him. They always ask me where my dad is, and it breaks my heart because they deserve to know the wonderful man he is when he’s sober.I’ve carried so much trauma over the years from getting calls that he was in trouble, picking him up during his relapses, taking him to the hospital, sober living homes, and rehab after rehab. I’ve spent so much of my life trying to save him.After 20 years of this cycle, I’m emotionally exhausted. Part of me feels guilty for even asking this, but at his age, is it okay to stop trying to rescue him? Has anyone else had to make that decision with someone they love?Please be kind. I’m just looking for advice from people who have lived through something similar. ❤️