Hey, I'm a TFOL and my favorite themes are Lego, Ideas, Architecture, and City. The City sets, I use in my own Lego City. My favorite set is the Lego Ideas Steamboat Wilie (21317) from 2019.
I mainly build sets according to the instructions.
Sometimes I also customize those sets (so they look cooler or better).
I also do MOCs (MyOwnCreations) for my city and dioramas for Minifigures, mostly CMFs (CollectableMinifigures).
Currently, I am experimenting with lighting kits for my Lego city. ...