You can do A LOT with the SJ Forester - from lift kits to lowering kits to tires and wheels to whatever... it all depends on what you want to do with it...
Soft-roader/overlander? Then you want to start with skid plates (I've got Primitive Racing triple armor on my 2014 Limited). Decent all terrain tires will help you get to places you want to go... some will be more off-road and some more on-road... I've got Continental TerrainContact ATs on mine - a good blend for off road ability and still maintain on road comfort. Lights, light bars, roof basket or storage, etc., can make you able to make the most of going out there...
Road racer? Then go with lowering springs or coil-overs to drop the ride... change out tires and wheels.
A couple of companies make plug-n-play fog light kits to swap out the stock units. You can also get some yellow film (Laminex) to cover the stock lenses with yellow coating to change the color and the shade of light. You can also buy aftermarket LED bulbs (some cheap and junky, some expensive and cool and some affordable and pretty good) that can change the tone of the light, too. Same for headlights.
If you have the stock/OEM splash guards, you've got a good start. You can remove those and do Rockblocks or one of the other brands too. most of them are designed ot stick out a bit further so they can look ... well, looks are subjective. But they can provide more protection to the side for rocks and such kicked up by those all terrain tires.
Wheels can be swapped out - you can go up or down in size (same with the tires) but be aware of possible fitment issues or error in your speedo and odometer if you change the total outside diameter of the tires.
If you have instagram, you can search out a lot - A LOT - of modded Foresters, from mild to wild, as well as on here.
As I said - it all depends on what you want to do with the Foz...
And congrats on the new Foz and welcome to sf.org...!