Back from a break (Uld)- GS Catchup

Morning wrath fam!

My retail guild finally killed sark on mythic and I have returned to WOTLK in anticipation for ICC (some of my best childhood memories here). I stopped playing about 2 months after uld was released, and my main is about 5k gs frost dk. I also have a mage (arcane/fire) that i'd like to use in ICC instead of the DK. GS on him is about 4.4k as of yesterday. What is the best way to get my GS high enough for TOTC and then ultimately ICC. not sure if guilds are recruiting rn this close to end of totc tier let alone for people to run uld. Pugs are impossible to get into at my GS. All i can do is run beta's, but cant seem to get any drops for rings or trinkets. I have both my conquest tier pieces and the rest of my gear is from betas. Any advice/help would be appreciated.