This chair is similar to the one I use in the office, although much less expensive. Easy to assemble (although the supplied allen key is clumsy, use a drill bit instead). The chair seems solid and comfortable so far, the lumbar support is good. I’m 6’1″ and 275lbs and it fits me perfectly.
https://www.amazon.com/BERLMAN-Adjustable-Computer-Armrest-Support/dp/B08LNKH6TD