Created a partition in the front of HDD with parted while it was mounted. What do I do so that my system doesn’t crash on reboot?

The command I ran is

sudo parted -a opt /dev/sda mkpart primary ext4 0% 100%
Warning: You requested a partition from 0.00B to 1000GB (sectors 0..1953525167).
The closest location we can manage is 17.4kB to 1048kB (sectors 34..2047).
Is this still acceptable to you?
Yes/No? yes                                                               
Warning: The resulting partition is not properly aligned for best performance: 34s % 2048s != 0s
Ignore/Cancel? Ignore
Information: You may need to update /etc/fstab.

The output of print is:

(parted) print                                                            
Model: ATA ST1000LM035-1RK1 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system     Name     Flags
 6      17.4kB  1049kB  1031kB                  primary
 1      1049kB  300MB   299MB   fat32                    boot, esp
 2      300MB   4347MB  4048MB  linux-swap(v1)           swap
 4      4347MB  124GB   120GB   ext4
 3      124GB   724GB   600GB   ext4
 5      724GB   1000GB  276GB   ext4

The output of fdisk -l /dev/sda is:

Disk model: ST1000LM035-1RK1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 86AB55F1-52A1-4F8C-ACE9-1A7B4C4E9082

Device          Start        End    Sectors   Size Type
/dev/sda1        2048     585727     583680   285M EFI System
/dev/sda2      585728    8491007    7905280   3.8G Linux swap
/dev/sda3   242864128 1414739967 1171875840 558.8G Linux filesystem
/dev/sda4     8491008  242864127  234373120 111.8G Linux filesystem
/dev/sda5  1414739968 1953523711  538783744 256.9G Linux filesystem
/dev/sda6          34       2047       2014  1007K Linux filesystem

Partition 6 does not start on physical sector boundary.
Partition table entries are not in disk order.

This is the drive that contains my OS and everything. What do I do so thatmy reboot doesn’t fail. Too afraid to turn off the machine right now.