It really depends on your skin type and how uneven your skin tone is.
Begin with meticulous skincare: cleanse, exfoliate, toner, and moisturizer. Exfoliate can help even out your skin tone.
There are also natural remedies you can use such as oatmeal, lemon, honey, vitamin C or vitamin B3.
If none of those work, there are over-the-counter remedies from Murad, Philosophy, and just about any beauty brand.
Once you've exhausted those options, consider laser skin rejuvenation. This gets good results and there are many new devices that take only a few sessions to get results.
Hope this information helps.