Any positive advice..

I've been with my SO for four and half years and engaged for the last two. We're young, 20 and 24.. We've pretty much lived together the whole time due to family circumstances, so we got comfortable with each other pretty fast. We got our first apartment on our own last year and a couple weeks ago moved into our first house on our own. We have typical fight and arguments like every couple does. For the past few months or so it seems like our relationship has fallen into "routine" like instead of exciting, loving, etc.. Nothing bad has happened, no relationship ending problems, or anything of the sort..but we are together just about all the time. We work at the same place but don't do the same specific job, live together, neither of us have much of a social circle or even really enjoy going out and I don't see that changing anytime soon. I'm posting this just to see if any of you ladies have any advice, tips, or suggestions on how to get somewhat of that new relationship "spark" back.. Anything is appreciated!