Timing is everything.
Plus understanding when vegetables flower, and true (not leaf beet) spinach is best example: whenever you sowed it, seeding/bolting happens by June.
So clear your first spinach then and plant lettuce to crop July to September.
Then 10th August sow spinach in modules to plant between the lettuce for harvests in autumn then spring until June.
Then you could clear and plant kale or whatever.
Use my Sowing Timeline, be familiar with best times for all veg https://www.charlesdowding.co.uk/sowing-timeline-for-vegetables/
Plus, most veg grow in half a season when you are organised with propagation and have plants ready.
