overclockin

Hello I tried overclocking my cpu and ram but it keeps on crashing after a while. The most stable it runs is on 3.5ghz ryzen 5 1600 and ram trident z rgb at 2666mhz. I'm fine with the ram speed being at 2666mhz but i want my cpu to atleast run at 3.8 or 3.75. Should i increase the voltage? what...