Pretty disappointed of my RX6600XT can you help me to upgrade?

Hi these are my spec:

(PCPartPicker)

CPU | AMD Ryzen 5 5600

CPU Cooler | ARCTIC Liquid Freezer III 240 A-RGB

Motherboard | MSI B350 GAMING PLUS ATX AM4 Motherboard

Memory | Kingston FURY Beast RGB 16 GB (2 x 8 GB) DDR4-3600

Video Card | MSI RX 6600 XT MECH 2X 8G OC

Case | NZXT H9 Flow ATX Mid Tower Case

Power Supply | Corsair CV450 450 W 80+ Bronze Certified

Monitor | LG 29WK600-W 29.0" 2560 x 1080 75 Hz Monitor

I'm pretty disappointed of my GPU

I bought it on eBay (used) to replace my old 1050ti (to play also a disappointing game: Hogwarts legacy). But I don't like it so much. I have a lot of instability and crashes on undervolt/overclock (vram) also if it's stable on cinebench.

And on next year I will live alone, and I was thinking:
Since maybe this is my last chance to save more and do upgrade, do you think I can upgrade my GPU on budget? something that is rock solid.

I care also about power consumption. So I don't want to buy a power hungry card. I just want to play on my ultrawide on 2560x1080 on more than 30fps.

I don't care about RayTracing, but FSR/DLSS is a must nowdays.

thanks a lot also if you have different advice for me.