$400 is pretty cheap for a camera, but believe it or not, nobody on this board cares what you shoot with. Despite some friendly rivalries and ribbing, we are all brand and camera type agnostic. Phone, film, mirrorless, point and shoot, dSLR, anything in between. NOBODY here cares what camera you use. If you can make magic with your $400 camera, then do it. Personally I've been keeping an eye out for a used film camera for less than $100. How much you spend isn't the issue.
Photographers care about one and a half things. The first, and main thing, is to go out and make photos. Use your gear. Capture photos. Save memories.
The other thing, which is only partially important, and not at all to some people, is to share those photos. Post to Instagram. Join the POTD thread. Display some on your walls. Ask a coffee shop if you can have a gallery show. Some people never want to share their photos, and that's okay; it's a very personal decision. I don't share photos of my kids very often, but otherwise I share here daily.
This whole fussing about megapixels and card readers and all of the other things aren't important to the actual making of photographs. Even if you do just literally point and shoot, the rest of it is just filler.