This could be mental plateau where working out loses its "excitingness" and it's pretty normal.

The first 30 days or so, usually is where you get most of your huge strength gains cause you are relatively starting from "0". We get that high of seeing ourselves change for the better but after a while, our body and mind gets used to it which makes it "less gratifying", "less motivating", etc. for us... which may lead us to getting bored and not going as much.

Aside from all the healthy and positive comments here, I would also recommend changing up your workout program and achieve progressive overload.

When I was new with all this, the biggest guy im the gym gave me an advice: it doesn't have to be big changes, just minor changes that could be as small as just changing your water bottle to make your session exciting.

I hope this helps and good luck!