Destiny is the only game my hardware has gotten significantly better and the performance has gotten significantly worse.

At this point I genuinely don’t know what to do. I have an i5 1300k an rtx 5080 and 48gb of ram and I struggle to stay above 100fps with the drops being into the 60-70 range which is quite jarring. Does anyone have any tips on how to maintain better fps without nuking the graphics quality. Is a cpu upgrade worth it? I am also playing at 2k res.