
Hi Haris,
I was in the same boat with a tiny walk-up and bumpy sidewalks. We had two strollers lose their front wheels to wobble. What finally worked was keeping our lighter stroller and tuning it. I tightened every fastener and used a dab of thread locker I already had and cleaned the wheel bushings, and slipped thin rubber shims cut from an old bike tube into the front fork to remove play. I also started locking the front swivels on rough stretches and always took curbs rear wheels first. After that it handled daily city walks without drama.
For stairs and transit I made it easier to live with. I practiced the fold until it was truly one hand, ditched extra accessories to drop weight, and clipped an old camera strap to the frame so I could sling it up the stairs. For shade I pinned a muslin cloth to the canopy for an extension, and I turned a fabric bottle sleeve from an old backpack into a cup holder with leftover Velcro. Lightweight strollers can be durable if you keep the load off the handles, check bolts weekly, keep grit out of the casters, and lock the swivels when the pavement gets rough. I still use that setup for park runs and trains and I have not lost a wheel since.