Hi Deb,
you can squeeze a lot in if you try! I'm only talking about space-bear in mind my climate is temperate.
In my small place-sort of possibly about 2000 square foot-
I have two espalier semi dwarf apples, an espalier double-grafted pear on quince dwarfing rootstock, a
vaguely fan-trained multi-grafted plum, a seedling peach that I'll brutally prune, ditto another apple,
A mountain pawpaw, two types of raspberries, thornless blackberry, boysenberry, two feijoa cultivars, black passionfruit, fig...
Anything that I can grow flat, and/or up, I do. You're already growing espalier, so you're clearly well on your way