My first suggestion would be to start ordering from a more legitimate and professional vendor in the future- one who doesn't follow this "paste" practice. This seems incredibly unprofessional- you can't even dose it properly (and all these vendors know what people are doing with their chems...) Making a "paste" by adding nowhere near enough propylene glycol to a quantity of etizolam doesn't sound helpful or useful at all...it sounds like something an unscrupulous vendor would do to obfuscate the actual quantity of etizolam in the finished product they're sending out, allowing the vendor to possibly sell customers less etizolam than they're advertizing. Only buy pure, unadulterated powder, and make your own solution in the future. Propylene glycol can be bought on Amazon for like $25 per gallon.
My second suggestion is to dilute what you have. There really isn't any way for to truly dose the product accurately since your starting quantity was "roughly 1500mg" and not an exact, known quantity (another reason not to purchase this product again or return to this vendor again,) so you're never gonna truly know how much etizolam you're using, although that isn't to say the "paste" isn't usable. If you're fairly certain how much"paste" contains one dose of etizolam then you can always dilute the "paste" with warm propylene glycol to turn it into a liquid PG solution that's workable and convenient.