Welcome! (To the toughest game in town: getting your work published)
But... If you keep your eye on cracking open (insert whatever tipple's your fancy) when you sign that publishing deal, you'll get there.
You'll need determination, grit plus an open mind ready to learn from what's worked for others and why.
If you (hopefully not, but) keep getting rejected by agents/publishers (30-50+ rejections, I would say), be prepared to go back to the manuscript and scrutinise it. Seek out constructive negative criticism because that's how you improve your work, the odd glowing review from your mum is a nice pick me up, but it's not improving the work. Once you get in too deep into the manuscript, it can be hard to work out if & why it's not working. Putting it away for a period of time usually helps, but if you've had a five year gap, that editor's eye is probably already there.
You've basically opted to repeat the stresses of the first three years of raising a child, but you just have to remember that you can & will get it published, if you dig in.
(Plus, I wouldn't worry about being unpublished, most writers are!)