There are many replacement screens available. You need to find a common cathode two digit (sometimes called two bit) 7 segment 0.4 inch display with white LEDs (LED colour is probably not important)

0.4 inches refers to the short edge of the display

I found this one: https://www.aliexpress.com/item/10050085...

Which is ~£1 for 5 of them

Make sure it's got 10 pins - 5 on each side