What's a good way to maintain healthy hair when it's colored? And how to make that color last?

use natural hair treatments weekly.use sulphate free shampoo that wont strip the hair.let your hair dry naturally.if you must use heat make sure you use heat protectant and low-medium heat.i recommend the mahogany Naturals hair treatments
https://www.etsy.com/listing/95858282/mahogany-naturals-pre-shampoo-treatment

Hi you would need to use colour safe shampoo and conditioner. The best one to use is KMS colovitality. it locks in the colour to the hair. It is formulated with IOPS (inside out perfecting system) technology, its also has UV filter in the products which helps to prevent colour fade from the sun and light. The price of the Shampoo is £12.30 and the conditioner is £13.00. They are very concentrated products so you only need to use a size of a 20 pence.