Referrals and/ or advice on landing quant jobs at hedge funds/trading firms/ AM?

Hello friends!! I've done early-stage interviews w/ Valkyrie, Bridgewater, HRT & late-stage (4 rounds) with Citadel, but wasn't able to convert these to actual offers. Does anyone have any insights into how to prep for these? Referrals would also be much appreciated :) Current TC 130k 2yoe #hedgefund #assetmanagement #trading #research #interview #quant #citadel #janestreet #wolverinetrading #mangroup #valkyrie #towerresearchcapital #hrt #millenniummanagement #bridgewaterassociates #blackrock #deshaw #renaissancetechnologies #twosigma #aqr #headlandstechnologies #point72 #susquehannainternational