What to do if i feel like my brain doesn't work as actively since having chemotherapy a year ago?

Time may still help: 'Chemobrain' typically lasts for up to about a year. You likely will continue to improve. My best advice would be to cope while you are still not back to your normal (ie. make more lists, leave additional time for tasks if needed, etc.). However, try to challenge your brain with activities that will help you to try to expedite recovery. Talk to your doc if not at least seeing some improvement.