Any advice on what to do with my cat?

So my cat has developed the desire to be outside or want a lot of attention but won’t let me give him that attention for long. I’ve tried playing with him and nothing. He lays by the back door and meows most of the day. I don’t know what to do now. Any ideas? Also he’s allowed outside but he has to have a leash and harness and I have to get his rabies and flea medicine first.

Any advice on what to do with my cat?
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