this happens to me towards the end of my wash cycle -_- (i try to only wash my hair once a week, twice tops) so to stretch it out, i use a verrrrrrrry soft boar bristle brush combined with this spray- works super well! they have it in different scents, but this is the one i've been using for the past 6 months and it has argan and hemp oil which are both great for hair! just squirt a little on your hands, run through the parts prone to tangles/tangled parts, and brush through with the soft boar bristle brush. i use this one :)
then afterward if you feel like your hair is a bit flat/limp (i also have fine, delicate, easily breakable hair so i know the styling struggle!) i will squirt a littttttle dry shampoo on the crown/roots, will brush through with a round boar bristle/nylon brush, and then use a hair dryer for less than 30 seconds just to give it some volume. works pretty well for the last 2 days before i wash again! i prefer to use batiste with a hint of dark brown because i'm a brunette and it doesn't leave any residue, and they also have lighter brown/blonde. this one by tigi is also ok but is definitely stickier than batiste i've found
since my hair type is like yours, i've noticed on the days i keep touching it cuz i have this nervous hair flipping tic, it gets greasier and knottier A LOT quicker, so try not to touch it at all!! hope i helped! :)
Edit: sorry the links formatted so weird- I input them on a desktop but just now saw on Mobile they came out all sorts of wonky. I'm sorry about that!! ��