Cherry Tomato Plants Blooming But No Fruit—Is It Too Much Fertilizer?

I’ve got three cherry tomato plants thriving in large pots on my balcony, and they’re covered in flowers right now, which is exciting. But despite all those blooms, I haven’t seen a single fruit set yet. I’ve been feeding them weekly with a balanced liquid fertilizer and making sure they get at least 6 hours of sun daily. I’ve also tried gently shaking the flowers to help with pollination. I’m wondering if I might be giving them too much nitrogen from the fertilizer, which could promote leafy growth but delay fruiting. Has anyone dealt with this? Should I switch to a fertilizer with less nitrogen or maybe cut back on feeding altogether? Also, do you have any tricks for encouraging fruit set on balcony tomatoes when natural pollinators are scarce?