Is there a more permanent solution to fixing the recurring drain leaks in my bathtub, despite using plumbers putty and gaskets?

I’m a bit stumped on this one. The bathtub, which is about 4 years old, was installed by a professional plumber with a drain hole. It took me about 1.5 years as a weekend DIY-er to finish tiling the surround. The first few times I filled it up, no problem. But then I noticed the drain was leaking (luckily it drips down to the basement garage so I could spot it). After watching some YouTube tutorials, I got a drain wrench and plumber’s putty to reseal it. I thought I wouldn’t have to deal with that again. But, lo and behold, the next year there was another leak. I replaced the under gasket and resealed with plumber’s putty, even though it seemed fine. The following year, same story. And now, another year later, I’m back at it again for a new leak. I’ve even included some pictures from the latest incident. Every time I find the old putty cracked and dried (even though the first time it only lasted a couple of baths before leaking). I’ve been cleaning out the old cracked putty from the drain and screw, applying a new layer, screwing it down, and