When you can see interleave that’s a good reason to change your tyres. My stock tyres on a model Y lasted 11,000km - but my daily drive is a tortured ribbon of tarmac with nothing but corners.

I don’t know what interleave means in your country but the way to measure tire wear is replace when tread depth gets below 1.6 mm.

Next time get tires with a 50k mile warranty, like Pirelli Scorpions.