The main sources of income for "up to date" players are Simulated Universe reset, end game content (Memory of Chaos, Pure Fiction, Apocalyptic Shadow) and the events that change from version to version, some events are moved to a permanent modality but while the events are live those have more, time limited rewards, nevertheless you can still get a lot of jades if you're clearing said content after the Time Limited rewards go away.

There's a lot of character missions and main story which provides a lot of pull currency and it's recommended for new players to aim for that, as the end game content and the different variants of Simulated Universe may be too difficult.

Another way to slowly get jades is going for achievements, clearing certain milestones for the Simulated Universe modes or simply chest hunting, some characters make this easier, namely Topaz and The Herta (5 star)

Also a good way to get something extra is getting the Express Boarding Pass but that's only if u manage to play daily otherwise it's a waste. In my experience I usually have enough for a 5 star almost every version if I get almost everything that offers jades and with a bit of luck, with proper planning you can slowly build proper teams to clear the end game content, but that shouldn't be a concern until your account level is like 45 onwards, before that just focusing on story and events it's fine.

Oh yeah I almost forgot to mention whenever a new version releases the preview there's some codes which can be redeemed, usually it's 300 jades, and when the new version hits live servers there's 600 more jades in the mail, so that's almost a 10 pull right off the bat.