Overheating problem

Hello, I have an i7-14700k but my pure rock 2 really can't keep up with cooling it at all. I won't be able to get a cooler for about another month or so, how should I undervolt my cpu until then to still have pretty good performance without overheating? Good cooler recommendations 100 euros or under would be nice too. I have an asus prime b760m-k ddr5 motherboard, I can't find the same settings the guys do in their undervolting tutorials in my bios and I'm quite new to all of this. Help would be appreciated, thank you.