Archery if you're up to the task. September in Colorado hunting elk is an amazing adventure. Weather will more than likely be better then rifle season. Being able to hear elk when being a beginner keeps moral up.
Randy Newberg, HUSH, and Born and Raised Outdoors YouTube channels will give you plenty of info. Also can see/hear mistakes they make and try not to replicate. Practice shooting and hiking up hills with weight on your back. Get your feet ready for punishment.
Less pressure early. In my experience I've had more encounters early too. Smoke poles and extra pressure throughout the month push elk in harder to find areas later in season.