When somebody says "memory" in relation to a PC, they are talking about RAM. RAM is memory. Discs are drives or storage devices. Or actual disks.
Your system uses DDR3. Anything new enough to be of any value to you as an upgrade is going to most likely use DDR4 or DDR5. There are a few platforms newer than yours, but still very old, that you COULD use your DDR3 on, specifically the Haswell and Haswell refresh parts, but you'd still need a different CPU and motherboard AND those parts are so old now that they wouldn't give you enough of a gain over what you have currently to even make it worth trying to find, besides which, you'd be buying hardware that is likely nearing or past the age where it's likely to fail anyhow.
I'd say you need to either be happy with what you have or be prepared to bite the bullet at least a little bit. Something like this, depending on what region you live in, could be a good option. You'd see a vast improvement in performance, even though it has the same number of cores as your current CPU, or you could spend just a little more and get one with 6/12 rather than 4/8.
PCPartPicker Part List
CPU: Intel Core i3-12100F 3.3 GHz Quad-Core Processor ($84.99 @ Amazon)
Motherboard: ASRock B660 Steel Legend ATX LGA1700 Motherboard ($119.99 @ Newegg)
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory ($37.99 @ Amazon)
Total: $242.97
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2023-07-24 14:53 EDT-0400
Unfortunately there are really no options for you on your current platform, for upgrading, that would make any difference, probably.
What is your current memory/RAM situation? How much RAM do you currently have and what speed is it? If you have very little memory or it's low speed, it's possible a memory upgrade could somewhat benefit you but honestly even that is money better put towards a newer platform at some point.