Practice practice practice. And if you wanna get more gear I’d prioritize an IFAK and a plate carrier over a shotgun.

Practice and prepare your home, make sure its reasonably secure.

Don’t know much about guns, but is that a roll of PLA top left ? Do you print accessories or stands or something for your weapons?

Whatever you do, please get a first aid kit and learn how to use it (and rotate the perishables!). I understand the point here is to defend yourself, but keeping yourself and others from losing their lives to injury is just as important.

not sure with an AR that a shotgun does you that much good; training should be the focus rather than kit

Training, naturally.

But also just as important (maybe more) find friends that you enjoy shooting with!