What cracked me up was... "I used everything to fix it. (I use meguiars)". If you used everything? Why you only have one brand posted???
Leather needs "Real care"
1.you need a suncreen visor
2. Up to bi-Monthly leather conditioner and cleaner.
3. Keep the car parked in shaded area.
4. Leaving windows mildly cracked in the summer. It helps slow down damage from excessive material breakdown from heat.
Leather is like this no matter what price of car you buy. Nissan uses a good grade of leather in this current gen Z.