Unfortunately, there is no magic "silver bullet" to cure that one; unless somebody invents a Time Machine, the past is the one period of time that none of us has any control over!
At the end of the day, all any of us can do is make the best with what we have. You at least have age on your side. Coming from somebody who is more than twice your age, 30 is not at all a bad age to be! Another advantage you have is having already completed a university degree (you didn't mention what qualification you gained there?). That definitely places you one step ahead of the likes of myself, who never managed to complete their degree until over the age of 60 (and even then, only gaining the equivalent of an Associate Degree).
It is true that all too many employers have rather unrealistic expectations of a job applicant - the old wanting somebody who is "17 years old and fully experienced" attitude still reveals itself on occasions! However, rightly or wrongly (and as I discovered), academic qualifications tend to be rated higher than practical experience. In my own case, although having worked at all levels in the industry from labourer to senior management, that lack of formal qualifications posed a definite barrier (very much a situation of "No degree qualification - don't even bother wasting our time!")
Being a JW doesn't exactly refine ones social skills, and as Finkelstein has already remarked, somebody like yourself gets rather quickly "sent to Coventry" by their former friends. There are, though, ways of making new friends, through involvement in various community groups - such as sports clubs, cultural organisations, social groups etc. In that way, it is a bit like moving into a new town.
The main idea is to try to keep looking ahead through the windscreen, rather than backwards through the rear vision mirror!