I've used Tech21 cases before and ultimately was happy with the quality. The case got beat up, but kept my phone in good condition.

There's also a couple cases by Caseborne (Armadillotek) That are pretty solid. I've got one of their R series cases on my S21 Ultra right now and it's survived a 10 foot fall onto rough concrete.

https://smile.amazon.com/dp/B09NL5TYG1/ref=cm_sw_r_apan_glt_i_PFFK0096WWV788D0W76J

https://smile.amazon.com/dp/B09N9X3TRL/ref=cm_sw_r_apan_glt_i_P6KM0M1P80ZY2F2HVHGW