Ender 3 Max Neo New hot end not holding heat

My Ender 3 Max Neo is having an issue. I have a new hot end but it will not heat up past 205 and if I speed up the print it goes into over heat alarm. I had this issue with my old hot end and thought a new one would fix it. I need someone smarter than me to help out.

Have you tried replacing the thermocouple?