AMD has 3 WRAITH coolers, the Wraith Stealth(65w tdp), Wraith Spire(95w tdp) and Wraith Max/Prism(140w tdp).
If you have the stealth, 70C is probably normal for that cooler. It's garbage, just as bad as intel's stock cooler. When AMD first launched Ryzen they were giving out the 95w tdp Wraith Spire with the Ryzen 1600, and reviewers praised it as being a great stock cooler, because it was. But when they released the Ryzen 2000 series, they gave out the 65w Tdp Wraith Stealth which is a horrible cooler and really only meant for PC's that aren't serious about keeping their clock speeds up in full turbo.
You should invest in a better CPU cooler ASAP if you're using the stock cooler on your 2600. You can get a Hyper EVO 212 or something that should be plenty fine for that CPU if you aren't overclocking too much.