How do I maintain my health and weight if I’m unable to gym consistently?

So, I’m 26F, I started gymming 1.5 years ago and I have decent progress (I have baby biceps which I love). However, gymming in itself is extremely … boring. The routine is so routinised, that the idea of going to the gym itself makes me feel bleh. It takes a lot of my willpower to drag myself there on most days.

So for variety, I started going for long 3-4km walks instead, and only going to the gym if I felt like it. I did do room workouts on some days.

But I’m afraid I’ll lose whatever muscle toning I’ve gained overtime if I take long breaks from gymming and only do walks or bodyweight exercises at home.

Yet at the same time, I’m very fatigued from the same ol gymming and most days I don’t even look forward to it at all.

Any guidance on what I should do? or if anyone has good results from consistently doing other forms of exercise at home?

For context- I’m a PhD student so I live on campus, so travelling for cult.fit type things (which I love) is not possible for me. Also, I’m very sports averse. I would rather dance and get tired than play sports :P