What do I do with my lemon eucalyptus?

What do I do with my lemon eucalyptus?

Hi guys, I have a tiny bit of a problem regarding how I should deal with my lemon eucalyptus. I live in a flat/apartment. That means a severe lack of space. My lemon eucalyptus has grown so tall on the ledge I placed it at that I don't know what to do with it now. Its tips are touching the ceiling; problem is I have absolutely no more space to shift it around with. Should I prune it? Will pruning stunt the growth after that? Someone suggests that I should bonsai it. But I'm not sure if it'd take to bonsai-ing after almost a year of unchecked growth. For reference, two pictures:
flower bed direction

flower bed direction

my abode

my abode

Bug ID and Lily ID

Bug ID and Lily ID

My home’s room is almost always messy

My home’s room is almost always messy

Container Question

Container Question

My closet is NOT included

My closet is NOT included