It sounds like it is time to upgrade the i7 7700 as it sounds like you should be able to get more out of a 2080 Super (also no need to upgrade that gpu at the moment, it's still up there with some of the best cards).
What would be helpful for completeness - could you list the rest of your specs... specifically RAM (size, speed, number of modules), Storage (e.g. NVME or Sata SSD or HDD) and what PSU you have? Also for your example of performance, it would be useful to know what resolution / settings you are running at - a 2080 Super should easily get over 60 fps at 1080p or 1440p, although if you are running at 4k for example it might actually be the limit of the GPU.
In terms of what to upgrade to, lots of good options at the moment, best value is probably Intel 11400, especially if you don't want to consider further upgrades for a while. The AMD equivalent would be the 5600X although that will cost more, you could also look at the older 3600 which is slower than the 11400 but probably fast enough to feed that 2080 Super. The advantage of going with AMD is you have more options for future upgrades without need to change motherboard (all the way up to 16 cores and potentially one more generation before they move to a new socket) however if you are talking keeping it for another 4 years that is probably not going to be much of a benefit as there will likely be better options on a new platform in 4 years time.