We should keep the thread going by adding lessons we have learned about taking care of relaxed hair.
ETA: I guess I'll start. 30 plus years relaxed checking in. My hair did not improve until I started using natural oils. So pick a heavy weight oil (olive, castor, etc.) to add to your deep condish and a lightweight oil (sunflower, almond, etc.) to leave in. Dont be heavyhanded and you wont sacrifice a bit of swang.
I may not have figured it all out yet, but this one thing helped me tremendously when I started out.