re: How can I improve my starter bow set?

Yep, like post above says you’re better off spending that money on some well built arrows, potentially learning to put them together yourself, that are identical and fit the bow, which is tuned to that arrow. The gadgets like a site and a rest are cool and some of them make you a bit better shot, but what will make you rock solid and consistent is knowing that all of your arrows fly the same, so if one doesn’t then you had a breakdown somewhere in the shot process.