I know the problem. I'm wishing some of my old seeds would not come up. Here I have a packetful of Marmande seedlings, summer cabbage seedlings, etc.
I am thrifty with space. I do not know your climate but here I try to grow everything that can be in winter. Everything that can be upwards. Intercrop, if possible.
A few notes:
1. Is it to scale? The land size the onion types occupy seems a lot compared to the potatoes and also the legumes.
2. I do not give a bed to legumes. You could try to squeeze them in on the side of the cucurbit and potato beds, also could hide some peas along the edges of beds near the tree. You would get a bed for roots or something else.
3. You could underplant the sprouts with the broccoli, the latter is much faster. Even with summer cauli for that matter, depending on variety. And once those are harvested your winter/spring leeks still would fit under them bigger plants. I usually would do leeks for early next year's use, these are sown in May/June and planted up end summer/early autumn.
4. Are you doing trench celery? If not, they need to be in a block, like corn. It is probably fine, however potentially asking for a bolting problem if planted in the same bed with peppers that need a tomato like feeding routine.
5. After new pots. Pretty much the place for overwintering crops as per Sunshine however there is no reason, why you could not put some tender summer crops after them (except for tomatoes-they are too close
). For example, your celery or corn or your entire cucurbit bed. Just a bit more feeding.
6. Cukes and courgettes. Tastes are different of course and you do not say, how many. I grow one courg, hidden somewhere in the compost/manure heap... hoping it dies. However, even if you are a sucker for them cannot possibly need more than 2 cukes. At any rate, if melon ripens readily on your clime the proportions seem contrary to the productivity of these plants. I'd say - from what can be seen - more melon, less cukes and courg plants.
Of course, you might be growing for chicks as well, this I do not know.
7. Up a trellis the cukes and some vine cherry tomato and certain melon also can go.
Fruit and rhubarb somewhere around the tree?