The game is insanely generous with currency. I've been playing the game a lot and managed to farm about 6k-7k jade. Here's where I get my jade from:

• Twitch Drops
• Webpage Login Event
• Promotional codes (these are still available for this month so look them up!)
• Achievements
• Levelling up (level 25 and 35 award 800 jade each)
• Aptitude Showcase (20 jade from trying Seele)
• Simulated Universe (unlocking the blessings awards a tonne of jade)
• Forgotten hall (this one is insane, I think it's like 600 or 800 jade per 3x stars you unlock)
• Operation Briefing
• Chests in the overworld (both main chests and puzzle chests)
• Adventure Missions (usually award between 20-60 jade)

There's probably more I'm not thinking of, but when you figure them all out you can farm a tonne of currency fairly quickly.

Also remember that when you summon on the standard banner (which you should be doing all the time with tickets as you get a guaranteed 5-star at 300x rolls) you can accumulate starlight and embers, which you can then trade for tickets to build up your stockpile even more.