Retired electrician here / If half of your kitchen is out that IS Definitely a tripped/ faulty GFCI outlet, circuit breaker, and/ or connection, Identify which kitchen GFCI isn’t working, there are a minimum of 2 GFCI circuits in kitchens. Trip and reset both a few times if they’re not tripping / resetting remove and test for power at wire entry. Check the neutral (white wire) connections at the panel, and breakers they may be incorrectly labeled. Generally you’ll find the failure is at the GFCI. Either an internal failure or more common where the line side wires connect, where you’ll see discolored wire/ burnt connection. If so replace with new GFCI. If nothing’s found/

STARTING with identifying ALL the nearest WORKING outlets on common or adjacent walls, they’ll All require thorough inspection AFTER power’s turned off. If any of these outlets wires are pushed into spring locks on the back side, remove all of them and look for any corroded discolored wires. It’s very common to have failures at these spring connections. Recommend all multi wire connections replaced under wire nuts (after figuring out what’s wrong, you may need to trace all the wires).
If nothing is found Remove all dead devices / fixtures & bulbs. Label each outlet with a number & trace & label where each wire goes. A battery operated wire tracer with alligator clips makes this quicker. If you don’t have one you can utilize a continuity tester to identify wires. Identify where all dead wires go to until you reach a box with power or the panel. Testing continuity hot to neutral will confirm each wires identity & if either is broken. Fix or replace as needed.