Depends a bit where you are. I am on the south coast and my garden has just about caught up.
But you could start preparing the beds, digging in compost and manure if your soil is clay. Research the plants you want and doing a planting plan.
There is something you can sow
Perennial Alyssum, Anemone, Orminamental Cabbage, Cactus, Calceolaria, Camomile, Chinese Lantern, Clematis, Coleus, Daisy, Dracocephalum, Forget-me-not, Gaillardia, Perennial Linum, Michaelmas Daisy, Myosotis, Nemesia, Perennial Pansy, Perennial Penstemon, Polyanthus, Primrose, Primula Malacoides, Primula Pulverulenta, Prunella Freelander, Pyrethrum, Strelitzia, Thyme, Biennial Viola, Wallflower.
Some of them you wont want in a cottage garden but quite a few that would fit in well.