I would say now is probably not the time to go into .45 ACP.
The trend is going 9mm. The cheapest I can find a box of 50 .45 ACP is about $20 at PSA periodically.
9mm is usually half the cost. I mean do what you want, but I’ll vote 9mm.
I own a handful of .45’s now and have no plans to shoot them again. Maybe someday, but every time I see ammo - I just cringe and pass on it. More recoil, more expense, and as it wanes in popularity it’ll see less defensive rounds brought to it. Most 2011’s and new 1911’s are in 9mm.
I’m just stating the obvious, but if you shoot low round count and enjoy it. Or live in a capacity restricted area… maybe it makes more sense.
YMMV. I recall you once shot USPSA any chance you’d go back? Would this help or hinder that decision?