Dual boot -- resized windows partition and lost grub -- only windows 10 boots

English Install/Boot/Login
8

Okay, it seems like your systems has quite some storage or is that 4 Tb one disk?

Would you mind sharing the output of lsblk, for my system:

> lsblk -o  +PARTLABEL
NAME          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS PARTLABEL
sda             8:0    0 931.5G  0 disk              
nvme2n1       259:0    0   1.9T  0 disk              
├─nvme2n1p1   259:1    0     1G  0 part  /boot/efi   lexar_boot
├─nvme2n1p2   259:2    0     1G  0 part  /boot       lexar_boot_efi
├─nvme2n1p3   259:3    0   120G  0 part  /           lexar_root
├─nvme2n1p4   259:4    0   130G  0 part  /data3      lexar_data
└─nvme2n1p5   259:5    0   1.5T  0 part              lexar_home
  └─cr-auto-1 254:0    0   1.5T  0 crypt /home       
nvme0n1       259:6    0 238.5G  0 disk              
├─nvme0n1p1   259:7    0   100M  0 part              EFI system partition
├─nvme0n1p2   259:8    0    16M  0 part              Microsoft reserved partition
├─nvme0n1p3   259:9    0 237.6G  0 part

It looks like you never tested your backups and have some special tweaks. Based on this I woul first try to reinstall the bootloader: