Is feeling sore a good indicator that you are using enough weights?

Hi,

I don't know if there are any people on here who have knowlegde about this, but anyways,
I'm trying to build a bigger butt (lol), and I'm not sure if I'm using enough weight.
For example, yesterday I did 3 sets of 12 repetions bulgarian split squats with 10 kg of weight, and now it feels sore, but not extremely sore., so should I add more weight?
Also, is it better to do more repetions/sets, or to add weight? thankss :)
Is feeling sore a good indicator that you are using enough weights?
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