Your temperatures are perfectly normal for all non-stock
Air-Cooling solutions.
If you're trying to get them lower consider a water-cooling unit such as
NZXT's range of basic water-coolers or something more complex (though installation can be very tricky with advanced water-coolers).
Kraken M-22
https://www.nzxt.com/products/kraken-m22
The above-linked cooler is easy to install on a CPU. You just need to make sure your case has a spare fan-slot for you to install the attached air-cooling fan.
Regardless:
55-70 degrees is entirely normal and totally acceptable for a CPU functioning at load.
If you want to see the hottest your CPU can get, given its maximum clock speed (that's the hottest your CPU could possibly get when functioning at its factory-configured maximum), you could download
Prime95 and stress-test your CPU.
Prime95:
https://www.mersenne.org/download/#download
Either of the first-two download options depending on whether you want a 32-bit or 64-bit test.
If your CPU doesn't automatically shut-down and restart the PC during the stress-test then you know your current cooling unit is correctly installed and can handle
anything you throw at the CPU.
Hope that helps.