You have all the major rifle calibers covered for North American hunting/shooting other than big bore leverguns i.e. 45-70 and really long range shooting, i.e. 50 BMG and 338 Lapua.
You don't have any former Commie rifles SKS/AK (if noisemaking on the cheap is appealing to you).
Perhaps try some handguns
.38/.357 S&W Revolver (everyone should own a K frame)
45ACP 1911
9mm or 40 S&W Polymer handgun i.e. M&P, Glock, XD, SR9/SR40
9mm or 40S&W alluminum handgun i.e. Sig 226, CZ 75, Beretta 92
No gun collection is complete without a favorite handgun(s)! Indoor ranges are always open when its too hot, too cold, rainy, snowy to go shooting outside.