I’m just now sure how to taper off. They don’t come in smaller doses than 5mg and that’s where I’m at.

Hang on, is it working? Didn't you say you take 5mg and it's been working for years at that level? I'd rank that as a win...

What form is it in? If its a capsule with dissolved oil, break the capsule and dilute the oil.

If it's a solid, just break it.

If you can buy a THC tincture, you can easily use dilution and volumetric dosing to titrate your doses down over time.

Split it until it’s 0mg.