Far be it from me to give career advice - only YOU know what all of your aspirations, talents and particular circumstances are - but I'd suggest that you try to evaluate everything as objectively and dispassionately as possible.
If going back to your former trade seems like the better option, then do it. Don't be put off by what other people may think, or the feeling that you have to cotinue because you've already made a big investment in aviation. There's no point throwing good money (or time) after bad.
Whatever happens, your 600 hours to date have not been a waste. Hopefully you've learned a lot about yourself, picked up a nice hobby that will continue to interest you for many years to come, and made some good friends.
Good luck with your decision.
MLS-12D
