Continued Development of Existing Platform

NOTE - WOULD BE VERY helpful if familiar with any of these terms: mlm, network marketing, affiliate program, compensation plans (unilevel, matrix, binary, enroller tree, business volume, compression, cycle) We have an existing MLM (Multi Level Marketing/Network Marketing) back office platform for helping to launch and run new mlm companies (nutritional, digital, solar, travel, etc affiliate type programs) that is currently functional and been developed for the past 10 years. Looking for some immediate help on a few existing projects, as well as an audit of everything we have to help us make some decisions, whether we: recode some stuff in a framework, find someone to take over and improve what we have, or start over, using some of the existing code as a reference... Software has everything from user management to products, orders, shipping, genealogies, commissions, apis for payment gateways, and commission gateways, contact managers, internal wallets, 1099 taxes at end of year... mailing platforms, and scaling mail server apis, sms integrations, and tons of user tools, like customizable capture pages, and mobile website builders, and qr code generators, and invoice creators, video postcards, plus a ton more.. Is written in php, mysql, using alot of jquery in the ui for the backend, is not all fully mobile/responsive, written mostly in procedural code, some bootstrap for front end, looking to improve.