DIY cables question

Hello,

I first dipped my toe into hifi during covid and being on a budget, I slowly bought used to build up my system including a decision to DIY my own speaker cables. I bought 20ft of Mogami 3014 wire along with some gold plated banana plug connectors and while having zero soldering experience gave it a go. To date everything works fine but I’m left questioning whether my potentially "shoddy" soldering work is my weakest link and is holding back my setup. I’ve been flip flopping back and forth on just buying some used name brand speaker cables so I can stop the torment. I guess my main question is, when wires work, is it black or white, meaning they either connect or they dont, or can bad soldering limit the max performance of the cables or furthermore my entire setup?

Aside from my DIY speakers cables everything else is name brand, I use AudioQuest Earth RCAs (TT to Pre) and AQ McKenzie XLRs (Pre to Hegel H360), and a Curious USB cable ( Stream Box S2 Ultra to Denafrips Pontus II)

Thanks in advance.