+1 to don't give up.
I'm still learning with veges but improving. They say it takes a few years to learn the skills.
Some things have returned their initial cost by many times: Giant Fordhook Silver beet, a free pack of rocket, lettuce, my two first ever potatoes grown from a couple of shooting spuds. Cucumbers did ok too , but zucchinis - apparently legendary producers were a complete flop. Tomatoes, well 50/50, but the wallabies ate a lot.
In my enthusiasm over 2.5kg of "free potatoes" ( from my two kitchen cast-offs), I planted several batches more, ignoring the fundamental that potatoes are a cool climate crop - planting them in full sun in the Australian summer was an error and yielded zippo.
On balance I'm probably just a bit ahead of breaking even, but I'm getting better at it .....huh roll on next season, I'm printing money.