So what’s wrong with my .38 Special for a handgun?
.38 special is the most popular handgun in the world. Like the .45 it has spawned a number of calibers and cartridges.
It will work fine.
Nothing. You described what you had, and asked for suggestions about what to add. I think .22 rimfire would be a good addition, considering you have a couple centerfire weapons.
Another fun gun is a good spring pellet rifle. Cheap practice.
So what’s wrong with my .38 Special for a handgun?
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Well I’d say it’s better than a .32 caliber.