Well, look, first of all, before it was “possible” and now it is possible, the only question is in the variety of hair care products, specifically your condition of the hair and scalp and the desire to use different products. :)
Strictly speaking, there are three basic care products: shampoo, conditioner and mask. And then there are oils, thermal protection sprays (if you, for example, often style, dry your head with a hairdryer), various serums. And we still do not mention the masks that some girls make with their own hands.)
The function of the shampoo is clear - cleansing the hair and scalp, there is no need to explain anything. Conditioner makes hair more manageable and also "seals it". The outer layer of the hair - cuticular - consists of many scales, which open during shampooing, which makes the hair more brittle and less resistant to injury. By the way, to reduce this effect, we recommend combing your hair after shampooing. So, the conditioner, as it were, "smoothes" the hair, puts the cuticle in place. And this is the health of the hair, and their completely different appearance - more shiny and smoother hair. And of course, they are easier to comb later.
Masks function as a conditioner + the one that you need depending on your needs. There are masks that are applied only to the ends of the hair, there are those that can be stretched along the entire length, there are only for the scalp (most likely, this will be a mask that stimulates hair growth). Always read the instructions carefully. If it is written that the mask must be kept for three minutes, do not hold it for 20 - most likely, you will not like the result, you will scold the manufacturer, but you have to scold yourself. There are masks that require additional thermal exposure. It is enough to wrap your head in a towel to enhance the effect of the mask. Etc. You must understand that recommendations and instructions are written for a reason.
We want to separately note that we do not agitate or force anyone to do anything. If, for example, you can easily do without conditioner or without masks, and your hair is dazzlingly beautiful and you like it - this is great, and this is, in general, enough to give up everything else. Focus on yourself, your feelings and desires.
Hair that has often been dyed or even discolored cannot be restored to a healthy state - it can be temporarily stabilized - no more.
For hair restoration - firstly, it is necessary to develop a nutritious and complete diet - hair often becomes thinner and begins to hurt.
Also - stop coloring them - even the most expensive paint - has its price for hair - it will not pass without a trace.
As I said above - do not pull it into a bun, with a hairpin - for too long - this puts passive pressure on the hair roots, causes migraines and hair loss.
Update my friend talks about masks - oily (burdock and castor warmed to rub in) and onions you can overnight.
Mustard mask for no more than an hour - details can be googled on request