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I was at one time having similar questions, never getting good images. Then I realised I was not having good technique of shooting. Fortunately we have very good resource of Videos made by Sudhir Shivaram Sir in this very website. Go through all of them and practice photography in the field. Is the image not focused properly? Is there hand shake? Is there subject shake? Is the shutter speed enough? Is the light falling on the subject enough? Is the camera set for high ISO? … so many parameters. Once we master these things, then we need to think of better equipment. Have you shared any images in the group? If so, please point out so that experts may be in a position to check. If not, share some and let the experts know.
I have written from my limited experience. Sudhir sir will reply separately when he is free.