Vegan lunch ideas please (that are easy to make as I'm not a great cook!)

I can't have soya and i don't like cheese so I don't eat the alternatives.

I'm a bit of a two meals a day person but I need to up my food intake as I'm breastfeeding and really not doing good enough. I want to have 3 meals a day instead (so lunch) and cut out the late afternoon biscuits 😂

Things I can make in advance and heat up in the microwave are ideal because I have a very clingy newborn!