Do you currently have 8th gen i5?  Benefit of i5 to i7 8th gen coffee lake is small. both are 6 core.  not certain it is worth the investment. on the other hand if you want to upgrade to 9th gen i7 i7-9700 which is 8 core it may be worth considering. Intel® Core™ i5-9500 (6 Cores/9MB/6T/3.0GHz to 4.4GHz/65W); supports Windows 10/Linux Intel® Core™ i7-9700 (8 Cores/12MB/8T/3.0GHz to 4.7GHz/65W); supports Windows 10/Linux Intel Core i7-8700 (6 Cores/12 MB/12T/up to 4.6 GHz/65 W); supports Windows 10/LinuxIntel Core i5-8500 (6 Cores/9 MB/6T/up to 4.1 GHz/65 W); supports Windows 10/Linux Intel Core i5-8400 (6 Cores/9 MB/6T/up to 4.0 GHz/65 W); supports Windows 10/Linux Technically removing old cpu and installing new one in this SFF takes a few steps.  refer to service manual.  If too difficult for you, send it to Dell depot for custom upgrade.
Hello,  I was thinking about upgrading the processor on my Optiplex. It currently has an I-5 processor but I was thinking about upgrading to i-7.   I've already upgraded to 32 gigabytes of RAM and converted to a one terabyte NVMe SSD. I've never upgraded a CPU before so I'm not sure if there's anything I should think of before simply purchasing a compatible one from the Dell store.    If I purchase a compatible CPU is there any extra steps that I might need to take in order to upgrade the PC?
Optiplex 3070 SFF CPU