There are ways to get the gems without trove- maybe not all of them, but enough to get you started.
What I've been doing is making alts, doing story for gems/mats and then mailing it to my main. I've got three Sapphires, three Citrines, and three Rubies from doing that. + Merchant of Wonders AP gems. Its doable, just slow grind.
In regards to OP, you can def catch up. My clan and I all stopped playing around the same time to try a different MMO. They came back a month and a half before me, and one of them is already almost maxed gear (no raven yet, but everything else