I'm currently also maintaining what i have. Stock is fairly set at this point, so it's mostly feeding, water changes, and minor tweaks as needed. Been keeping fish since my early teens, and during the move to start my career two years ago, I looked specifically for 1st floor apartments that allowed aquariums so that I could set up a 75G.
As for where the hobby is taking me, my current plan is to buy a house next year so I'm sure that'll bring great changes and possibilities. The first thing I look for in every house is where the aquariums would go. Goal is to have a 300G+ monster tank, a mid sized (50-70g) saltwater reef, and a small (10-20g) planted dwarf shrimp tank.