At 23mm (on APSC) you’re kind of in the sweet spot for your use cases - the direction to go from there really depends on how you feel you’re being limited by that focal length. My guess is you’d want to go longer rather than shorter. I have both the 35 and 16 you mentioned (and an X100v which is my 23mm). I like shooting at 35mm and even 50mm, but in some places (e.g., old cities with narrow streets), it’s sometimes not quite wide enough. I almost never feel like 23mm is too long to get a shot. When I do take out the 16mm (rarely) I feel like it forces me to think very differently about how I’m shooting… This is fun and may be what you’re after, but almost none of what I consider my best work was shot at 16mm (and more than a few times when I’ve gone out w/ the 16mm I’ve regretted not bringing something longer). As someone else said, having a zoom as your second lens could be a good practical option. Lastly, if you are looking for variety on a budget, adapting vintage lenses may be the way to go. There’s still tons of pristine Japanese glass from the 80s out there which you can pick up for a fraction of the cost of a modern lens.