New equipment usually helps somone shoot better, for about a month. You excited now and are probably practicing more and paying more attention, so of course you are shooting better. Also the boost in confidence is great help.

I think a mistake many archers make is trying to shoot better than they really can. Like longer distances and small groups than are realistic. This kills your confidence and just makes it all that harder.

So I would say it's mostly you, but hey if it works it works.

Paul