The power supply of your system looks to be limited to 300W, that will limit your GPU choice severely.
I had a look on Newegg, and it looks like you might be able to squeeze in an RTX3050, which would be a good upgrade, but personally, I would go for more RAM first.
You are limited to only DDR4 memory, but you can max it out with 32GB. I checked on Newegg, and you can get a kit from Crucial with two 16GB modules for less than 150USD:
If we got back to your PSU, your power supply, here you need to verify if it is a standard PSU, computer manufacturers like Dell and HP will often use non standard power supplies, I don't know about Acer, so you need to research that before you run out and buy a new PSU and GPU if you want something more powerful.