So I have been an extract brewer for about a year now and have made around 6 batches (busy schedule). I feel like there's something lacking in some of the beers I've made and would like to upgrade to make a more quality beer. What should I upgrade to?

I would like to go get an all grain setup, but I am honestly confused on what EXACTLY I would need to buy to upgrade, and then how the process completely changes.

I have heard that kegging your beers is a good place to upgrade with your beers, but as well I don't own a kegerator, or have a spare fridge to mod. Also, I think being in an apartment as a college student, I wouldn't have too much space for one here anyway...

Is there something else upgradeable I could look at, or is one of those two options better? Help me /r/Homebrewing, any suggestions appreciated!