My hair won't stay curly anymore for longer than a day..

in Hair Type 3
Almost two months ago I went to a curly hairdresser. Before that my hair was pretty long. The hairdresser used thinning scissors and cut pretty much hair off. I didn't really mind, because I just wanted more volume and healthy hair. When I got home I already regretted going to the hairdresser, but I gave it a chance. The problem is that on wash-day my curls look (slightly more) defined, but the day after most of my curls are gone.. So the days after, till the next wash-day, I leave my hair in a bun. I use the same products and style my hair pretty much the same way. I've never really had this problem before. 
How do I get my curls to last longer than just one day? Is this problem going away after my hair has grown longer again?

How do I get my curls to last longer than just one day? Is this problem going away after my hair has grown longer again?
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3A/f/i
Super baby fine hair, low porosity
Shampoos: SM Fruit Fusion (mostly), Avalon lemon (to clarify). Occasional aloe vera and glycerin to wash.
Stylers: Intelligent Nutrients Perfect Hold Hairspray
Treatments: Catnip tea, IA girl's PT, Fermented Rice Water, Catnip Tea, Amla tea, Irish Moss, SS PT
3A/f/i
Super baby fine hair, low porosity
Shampoos: SM Fruit Fusion (mostly), Avalon lemon (to clarify). Occasional aloe vera and glycerin to wash.
Stylers: Intelligent Nutrients Perfect Hold Hairspray
Treatments: Catnip tea, IA girl's PT, Fermented Rice Water, Catnip Tea, Amla tea, Irish Moss, SS PT
Kayla
Youtube - Website4b/Density:iii/Strands:Fine, MBL
Type: 3a | NP | med-fine but high den | bob
NP: Deva NP, DC low poo, ACV rinses
RO: Deva 1 Cond orig or decadence
DC: DC HIC, SM JBCO mask
LI: 1 Cond, B'leavin
Styler: Deva SPC or reg SC
Gels: DC LDG, Bouncecurl
Refresh: water w Lavender oil.
Scalp: Lav/jojoba/rosem/pep oils.
Airdry, wait 30 mins before diffusing.
Loves a little protein in stylers! Hates heavy stuff.