A few things:-
Stretch your relaxer 3 months plus
Rollerset your hair
Use volumising shampoo and conditioner
Try and minimise the heat usage
as a first approach, have you considered no longer using the products that have made your hair lifeless?
the relaxer may be eating away your hair and/or leaving it limp/lifeless. You should do a long stretch and see what your texture is like. Try out some products that are for strength, restructuring, and moisture.
From your siggie, it looks like you may have too much product in your hair and it's weighing it down. Try a clarifying shampoo and a light conditioner on your ends only if you are planning to wear your hair out.
What brand and strength of relaxer are you using? If your relaxer is too strong it can cause the hair to be weak and limp.
I use organic root stimulator (regular) since 2010. Before I use to use soft and beautiful (regular). Ummm, you got me thinking about this, every since I been using organic root stimulator relaxer my hair has gone downhill. With that being said I should go back to soft and beautiful. But I plan or stretching for the rest of this year.
Have you ever done such a long stretch before? If not, please take time to read the number of threads here on stretching as long stretches can have detrimental effects if you don't use the necessary methods to care for your hair. It is likely that you will need to employ different techniques in order to maintain hair that is deep in a stretch as opposed to hair that is six weeks post.
Have you done a moister and porosity test. After combing hair take a strand of hair and pull from each end and see if stretch? Then place strand in glass of water see if it floats or sink?