Add disk to raid 1 array on ubuntu

After the physical disk change on the server due to the disk failure. It seems that a new disk is not in the raid.
This is an alert I'm receiving every day:
P.S. The /proc/mdstat file currently contains the following:

Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sdb3[1]
2111699968 blocks super 1.2 [2/1] [_U]
bitmap: 16/16 pages [64KB], 65536KB chunk

md3 : active raid1 sdb4[1]
5697341760 blocks super 1.2 [2/1] [_U]
bitmap: 41/43 pages [164KB], 65536KB chunk

md1 : active raid1 sdb2[1]
523264 blocks super 1.2 [2/1] [_U]

md0 : active raid1 sdb1[1]
4189184 blocks super 1.2 [2/1] [_U]

unused devices: <none>


I am looking for a freelancer who can add a disk to my RAID 1 array on Ubuntu. The ideal candidate should have experience with RAID configurations and be familiar with Ubuntu operating system.

Requirements:
- Strong knowledge and experience with RAID 1 configuration
- Expertise in the Ubuntu operating system
- Ability to add a disk to a partially filled RAID 1 array
- Familiarity with SSD disk type

If you have the necessary skills and experience, please submit your proposal for this project.