u/General-Brother-5331

I've been doing photography for about 4 years now and I think its time to upgrade. I've been shooting on a Canon Rebel T3i DLSR camera and I now want to purchase a Mirrorless camera. I usually shoot Planes, Wildlife, cars and budlings and cropping with my camera isn't that great. I want to get more into other styles of photography like sports and portraits. I'm looking for something with high MP, good auto focus, fast at shooting, and mirrorless. Is the R6 mark iii a good camera worth spending 2.8K paired with the RF 100-500mm F4.5 or should I be looking at something else.