Yes Lucie you started well but are only part way there. When soil is covered with couch, I recommend black polythene for total light exclusion, unless you want to plant straightaway (which is when organic matter is good – but needs weeding…).
I have the same thing at Homeacres in patches of the garden where couch was obviously well established until I made beds this winter. They are cropping well now but I go through twice a week with a trowel to lever out the shoots of grass which keep emerging, and bindweed too. As Bluebell says, it is a long process but I hope you are growing veg too in the manure on top.
As for new weed seeds, they need dealing with as soon as you see them, when small: hoe or scuffle with a trowel or pull them.
Your first year is clearly difficult, you had a weedy plot. If you feel fazed by it now and are not planting, I would cover with plastic, half the plot at least until next spring, and crop the rest.