I've tried to maintain this code while ago but IMHO the one thing this needs is a complete rewrite, there are so much outdated function and stuff in. You just want to fix it one by one but that's the wrong way, do it new, do it smooth.
Make a github and start with the api kinda like High-Traffic Plugins > Store
then you can add one plugin by one, start with account system, then jobs, etc..
Make it step by step and stop using you old code.
We've no problem if you write in old syntax but after you are done look how to convert it to new syntax and do so.
You need to make a good structure/concept, only you know how this mod should be and this doesn't help us, it makes it more difficult to understand where you want to go with this mod, should it be like Deadly desire or completly something else..
It is really hard to get a seccussful mod in csgo because people hop in csgo to have a fast quick game, they play inbetween there break from matchmaking, people don't want to put lots of playtime into something. Anyway take a look at deadly desire code: https://github.com/ts-x/TSX-RP
it is french so use google translate if you need it.
I think you will get some good people working with you on this code on a fresh new api on github.