Looking at your photography you don't need another lens to create good photographs.
However, we all like to experiment with lenses and I'd recommend you choose something unusual for your style and just enjoy using it.
The good news here in the UK is that there are several good second hand sources of lenses so the cost of experimentation is not that great (you can always, send back, resell etc for no/very little difference in purchase price).
For example, I am blessed with acquiring and owning a lot of Fuji glass over the years. But I never had the 56mmf1.2 and although I didn't need it I bought one (from eBay this time) just to 'play' with. I like walking around and with only this lens and then finding ways to create interesting compositions.
So, my advice is to do that. Buy something you don't necessarily need but would enhance the pure enjoyment of photography.
Just my two cents.
LouisB
X-T4, XF 56f1.2, f1.2, iso250 1/200 56mm