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Consider the Lumix FZ80. It is half the price of the Nikon P900, smaller, lighter, and has the same size 1/2.3″ sensor. The FZ80 has a fixed zoom lens with equivalent focal lengths of 20mm to 1200mm for wide angle to extreme telephoto shots, and shoots 4K video. With the rebel T6 you will have to buy lenses. With the 18-55mm and 75-300mm kit lenses your equivalent focal length will be 28mm to 480mm.
With the Lumix FZ80 you can set your pictures to square format and small size (1824×1824) which is within the instagram maximum upload resolution of 2048×2048.
Really? Why not try your phone camera? It’s good enough for Instagram