According to the factory build sheet on all Sahara Wrangler, the standard gear ratio is 3.21 (unless otherwise stated). Although the jeep is very capable as is, Your current 3'' lift with 33'' tires would/could might stress the system. Here's how to check what gears your jeep is installed with:
1) Run the vin number for the build sheet
2) Check the rear deferential for a stamp or tag located on the side or near the def cover.
I'm under the impression (unless you have documents the gears have been changed) you're running the 3.21 gears. If one wants to increase the tire size, one would need to research what gears can be installed in the current Dana deferential. In other words, simply replacing or upgrading the ring & pinion to an optional gear ratio may be limited as to what size you deferential is. Here's a reference chart of the most common def covers and their associating Dana numbers.
You're mainly interested in the Dana series numbers: 30, 35, 44, 60 etc Typically the jeep would or could have the 35 front & 44 rear. The Rubicon/Recon would have the Dana 44 front and rear. Note the greater the number posted on the Dana image above, the taller the def cover gets based on the larger ring & pinion set installed.
Getting back to your original question, I would sub to a local news letter or jeep group in order to participate in jeep trail rides. It's not wise to go off roading by yourself IF you've never done this before. Never go solo in the jeep or outside the jeep. Meaning always have someone to help you if you become stuck, have on and offline mapping or communications. Locate local off road training centers or mild training trails within a controlled environment. This would mean a small fee would grant you a day pass to drive a predesignated coarse/trail for beginners.