I have some roses in very large self-watering pots and I have 30+ roses in the ground
Your roses are weak and their leaves are thin and a feast for aphids
You need a bigger pot and to cut the rose right down to about a couple of inches above the scion (grafted join). Roses are very tough and it will soon throw up new and healthier shoots. Use mycorrhizal fungi around the roots
It is far easier to put the rose into the ground, plus the m fungi. Still cut it right down and that will give the roots a chance to establish and be strong, which will make the rose stems and leaves strong
They will be much better in the border. You will have to water from time to time if we have a drought and/or until the plant looks established. No need to water too much, nor give fertilizer at this stage as you don`t want overly lush growth this year