Cards massive trade

Find someone who trades them in bulk (hi there!), then negotiate.
And no, you can throw everything into one trade.

A few questions before I can give advice.

Are you willing to overpay?

Do you have Steam auth enabled?

Do you have any games in mind that you want to trade with those cards?

You can download Steam Inventory Helper, a browser plugin, and then sell all of your cards at once in just a couple clicks. Sad news is you'd still have to individually click on each card in your phone to confirm it, so... shrug. Traders do trade for cards in bulk on the forum, so you should have no problem.

My friend trading massive amounts of cards for keys http://steamcommunity.com/id/pandatelt/ try to add him and tell him what you need, maybe he will help you figure this out

You can also open a trade topic here, there are some of us who trade game keys for cards happily. Heck, my barter profile is now more or less set to that kind of trade exclusively.

6 complete packs of cards = 1 CS:GO Key

You can go to the Trade Section. And no i dont say this to post trades, i say it so you can look at prices and get yourself familiar. People who constantly trade there have ideas of prices so you can see which games how many cards and how it works. Can take from 30 mins to few hours depending on how much research you want to do.

steam.tools/itemvalue/ check value here
edit: nvm I'm late :O