I don't know what anyone else said, but here's what I'm thinking. You can turn your little grocery store job into a great opportunity to witness. As you're surrounded by fellow workers, and regular customers, you'll get to know them, and you'll be able to witness to them.

Also, what ever keeps you pioneering, man. Jehovah will see to it that you're taken care of. I'd rather be happy - at my job, and out in service - than making tons of money. But that's just me. There's a lot of money out there, and, yes, I'm sure you are more than capable of getting a well paying, "prestigious" job. But the MOST prestigious job is the one you've already got--being a full time pioneer, and servant of Jehovah. You are one of his personal spokesmen!! Any "humble", or "lowly" job that keeps you in that position is glorified by the real job you've got.