I'm WL.
Read up: watch YouTube, read what's out there, find out the benefits of certain products and techniques, and learn the science of your hair (PH balance, ceramides, inversion, banding, hair's molecular makeup, steaming, no-heat styling, hair porosity, pre-poo/no-poo/lo-poo/co-poo/co-cleanse/co-wash/mud wash, silicones pros & cons, etc.)
Evaluate and reevaluate: when trying anything- product, technique, whatever- really evaluate how it works for you. When something is working well and you're bored, that's the best case scenario.
But come back to it every once in a while and see if it's still working. If not, think about why. Is your hair longer, so you need to use more product? Do you need to do it more/less often?
Find your faves: for me, I started with VO5, whole and essential oils, and botanicals, and never found a need to try anything else. Figure out why you like certain ingredients (eg, ceramides impart shine, henna strengthens hair, fenugreek provides slip, etc.)
Protein/Moisture balance: I henna and henna gloss my hair (which I HIGHLY recommend) and can clearly see the difference when my hair is protein overloaded (straw-like, brittle) versus moisture overloaded (mushy, prone to tangles). It doesn't have to be as drastic as henna or 2-step treatments, it could be as simple as adding hydrolyzed protein to your favorite deep conditioner.
Protective styling: I tend to do protective styling for a week at a time. Within the last 6 months, I've started Bantu knotting the ends of my twists and it's really keeping my ends in order.
Search and Destroy: Find and eliminate single-strand knots and splits in real time. Trim only as needed, and otherwise hide your shears.
Deep condition: don't go longer than a couple weeks without deep conditioning your hair. I personally deep condition weekly.
Detangle: whether you finger detangle or use a comb/modified denman/tangle teezer, make sure your hair is thoroughly detangled. I also recommend washing your hair in twisted sections to make sure your hair
stays detangled throughout a multi-step wash day.
M&S: figure out how best to deliver nourishment to your hair. LOC method? Oil rinsing? ACV rinsing? AVJ sealing as a final step? GHE method? For me, ACV rinses (also see pt. 1 re hair science), Ayurveda, and natural ingredients are holy grails. Your hair might prefer leave-in liquids over heavier lotions, oils over butters, etc. And you'll need to reevaluate season by season.
Be healthy: exercise is good for blood flow, which is good for hair growth. Water is essential for overall health and also aids in hair growth. Vitamins and supplements support various body functions like joint health (MSM, for one), cardiovascular health (garlic, for one), reproductive health (maca, for one), etc., and also aid in hair growth. Scalp massages are mood elevators for me and evidence suggests scalp stimulation aids in hair growth.
Take a vacation: at some point, you will get tired of your hair and want to do something drastic. When that day comes, put your hair away (under a wig, in braids or twists with added hair, etc.) and wait it out.
Another poster mentioned not using heat. I don't use direct heat (I do heated DCs), but some people find that keeping their hair straight helps with managing tangles. It really is a personal choice. As with anything else, you just have to be hyper-vigilant about your hair health and evaluate your methods/choices wisely.
ETA: also, take your hair into your hands whenever you can. The "professionals" don't always care.
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I drink an average of 100oz a day. 
