This depends on your fitness and aesthetic goals. If you are still looking for results, you’ll need to up your weights, and also vary your workouts as our bodies adapt quickly to routine. If you are at your goal weight/aesthetics, then keeping your weights as they are will simply maintain your hard work. Even if you aren’t looking for further muscle gain/fat loss I would still suggest varying your workouts – even if the intensity doesn’t change. Keeping your body keeps your metabolism fired up and recruits different muscles for a more effective routine over time.