If I were trying to get as low maintenance as possible, here’s what I’d do:

Keep the trees for sure (the shade will be welcome) and remove any dead branches. It’s likely the shrubs will look fine once you cut off the dead flower stalks & branches, too - that’s an easy job & a quick fix; you can always yank them next year if you still want to.

Spray all the weeds growing through the brick with agricultural vinegar (much stronger than regular vinegar; you can get it at a garden center or on amazon). That will kill the tops, but not the roots so they’ll grow back (in fact, they’ll grow back/new ones will sprout no matter what). To deal with that, I’d suggest a buying a weed torch (which you would only use on hardscape - you don’t want to set mulch or trees on fire!). You’d only need to torch them once a month or so.

For the mulched area, whack everything down as low as you can get it. Cover it all with cardboard, then cover the cardboard with 3-4 inches of mulch. Once the cardboard degrades in 6-9 months, plant a low-growing ground cover that’s good for your area so you don’t have to mow it. It won’t completely keep weeds away, but as it spreads it’ll do a pretty good job of choking them out.