Looks like you have done great so far regardless of what weight you started at. What had you expected to lose by now?
What are your stats? Height and weight? It would be helpful if you filled in your profile.
you're bound to get 100 different answers here because people's tastes vary so much, but I'd get a bunch of individual packets (some companies sell them by the packet) so you can try them before you invest $30 or $40 in a big tub of something you might not like. Syntrax, for one, sells sample packets (you can get them through the Bariatric Pal store) - and a few other companies do as well.
The BariatricPal Store carries a huge selection of Bariatric friendly Protein Drinks at https://store.bariatricpal.com/collections/protein-powders.
Here are some popular options:
BariatricPal Protein ONE: Multivitamin, Calcium, Iron, Fiber & Meal Replacement Single Serving Packet - 9 Flavor variety pack from https://store.bariatricpal.com/collections/protein-powders/products/bariatricpal-protein-one-multivitamin-calcium-iron-fiber-meal-replacement-single-serving-packet-9-flavor-variety-pack
Syntrax Nectar Protein Powder Sampler Variety Bag - All 17 Flavors! from https://store.bariatricpal.com/collections/protein-powders/products/syntrax-nectar-protein-powder-sampler-variety-bag-all-17-flavors
GENEPRO Medical Grade Unflavored 30g Protein powder - 2nd Generation! from https://store.bariatricpal.com/collections/protein-powders/products/genepro-medical-grade-unflavored-30g-protein-powder-2nd-generation
Bariatric Advantage HPMR High Protein Meal Replacement - Available in 8 Flavors! from https://store.bariatricpal.com/collections/protein-powders/products/bariatric-advantage-high-protein-meal-replacement
Single-Serving Protein Powder Packets - Super Jumbo “60 Flavor” Sampler Pack from https://store.bariatricpal.com/collections/protein-powders/products/single-serving-protein-powder-packets-super-jumbo-60-flavor-sampler-pack