Android Data Recovery in Bootloop (xiaomi Y2) OS Corrupt + Bootloader locked. Any Solution

how did you fix it ? my phone is redmi y2 and it got stuck on redmi by xiaomi logo and i can get fastboot but that main menu for reboot comes very rarely and when i choose reboot i get a light faint blue screen and nothing else , and this time i chose mi assistant and studied a lot about flashing the phone my data is so important i cant lose it . please help