Right I will go into BIOS settings and adjust the graph manually. I think If I apply new thermal paste and reseat the cooler it will possibly improve. However if I adjust the graph and it doesn't affect the temp in anyway, is it best to leave the PC and wait, or is it safe to game? I would think it isn't safe to game.
Don't bother with 'reseating' the cooler, your temperature is pretty much normal for a Ryzen. The temp-curve in BIOS is the fan profile settings and doesn't directly affect processor temperature, only how fast the fans will spin with temperature in a (mostly vain) attempt to cool it off.
Ultimately, the stock cooler is just barely adequate and will scream like a banshee when you turn it up. A 3700X really needs a large aftermarket air cooler or a 240mm AIO to work well. Also, understand that Ryzen boosts aggressively to max clocks even at idle and that will spike temperature when it does. It's the way Ryzen works, so expect temp spikes going up to to mid 60's at idle on stock cooler, that will pulse the fans if you don't use a fan profile that ignores them.
When pushed hard 3700X temps will go up to the mid-80's, or even higher if case air flow is poor or you don't want to hear the stock cooler fan screaming. Even with a good air cooler or AIO it might get that high but the fans will be a lot more tolerable, at least, if you adjust them right. Tjmax is 95C so you can feel safe with temps going up to about 90C.
The temp spikes aren't really significant thermally speaking so get a proper monitoring utility...Hwinfo64 is best...to monitor the average temperature which is the true thermal state of the processor.