Help with chard plant

in Fruit & veg
Hi I have had this chard plant for 2 years. The first year the leaves were big enough to harvest but after it flowered last year the leaves are much smaller. I did cut the flower spike off which might have been a bad idea.
Does anyone have any advice on how I can help it. I have been pretty bad and never fed it.

London
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.