Forego another gun, buy ammo.
Regular, structured practice is the non-negotiable key to performance.
Purchase both duty JHP and practice ball. Purchase an amount of a recommended duty load and vet the ammo through your gun for function and POA/POI, then have whatever amount on hand that satisfies what you assess is your need, ie, X number of mags loaded and their refill, plus a cushion.
Do the same thing with practice ammo. Purchase small amounts of several brands to test, then start buying case quantities. Dollar cost average ammo purchases since price and availability routinely, though unpredictably, fluctuate wildly.
The upcoming fun and games called "The Election" is likely going to cause some shortages and even panics as tomfoolery commences, so I'd get on it.
I try to keep a roughly 6 month supply of ball on hand to support a training schedule of 100 rounds per week. That both ensures I can maintain skills in the event of a shortage(a'la Covid) and that I don't have to pay usurious prices during the various panics that engulf the industry.