The best camera is the one you have with you. There is always a temptation to run out and buy the latest one on the market. With DSLRs the real fact is that for the most part, substantial changes are years apart these days and any one of the offerings that you buy from a major manufacturer will last for several years. Eventually it will be worth investing in a new camera body. In the meantime, invest some money in better lenses than the ones the likely came with your camera. They will work with future bodies for many years.
Cell phones are a bit different in that they are progressing rapidly and its worth comparing the images your current phone to those from newest model. The iPhone 6 for example takes wonderful pictures and many of mine were taken on one. The iPhone 7 I use now is not much different in most light. Where it shows its new skill is in low light photography where there is less digital noise in the image. When you see a signifigant gap between what your phone will do and what the newest can accomplish, its time to add photography to your list of reasons for upgrading!