Like others said, the basic processor that you have seems just fine for the type of photo editing that you probably do. However, it may be slow for other reasons than the processor and may have a bottleneck somewhere else.
I have a very similar processor in my 7 year old computer and it does fine unless I want to play a very recent game or if I did video editing or something more than basic photo editing.
The biggest things you could do to speed up your current system would be 1) upgrade ram to at least 16GB, 2) run your operating system and programs off an SSD drive instead of a spinning disk, 3) if the slowness is in modern plugins like Topaz, then install a discrete video card, even an older one like an NVidia GeForce 1060 would be ok and 4) get rid of software or viruses or anything else hogging resources and running all the time that doesn't need to be running every time you start up.
Probably a computer shop could do these things for you, but in the end it might cost enough and be enough of a hassle that it's worth it just to buy a new computer and might last longer.
Microcenter is fine and they have stores in some areas of the US and none or only a store or two in some other entire regions. Of course you could order online.
If you want it to be portable, then a laptop (and monitor) could be fine. I've had pretty good luck with Asus products among larger PC brands and not so much a fan of Dell and some other brands.
As important as brand are the specs since most brands make everything from very inexpensive and slower to more powerful models.
Similar to above, if I was buying new I'd probably aim for:
1. At least 16 GB of RAM.
2. Operating system and programs on a SSD or NVMe and should be big enough to fit what you'd use and with some room to spare. Though it's fine to put your photo storage on a spinning disk and maybe even a faster external USB drive (USB 3 or later) or transfer them to one once you're done actively working on them.
3. Decent processor: in Intel an i5 or i7 probably (which are basically their consumer mid-range or faster ones). AMD processors are also fine if they're not the lower-end ones.
4. If doing a lot of effects that can use a Graphics Processing Unit (GPU), then get a dedicated video card (not the video built into the cpu and motherboard). Though I don't think this has to be the highest end gaming card for how you'll use it just for video editing.
I haven't priced things out lately, but I'd guess you can get something really great for your needs in the $1,000 to $2,000 range, and maybe even a lot more than you'd really need.
I like specs for something like
ASUS ROG Strix GA15DK Gaming PC Platinum Collection; AMD Ryzen 5 5600X 3.7GHz Processor; NVIDIA GeForce RTX 3060 12GB GDDR6; - Micro Center for $1,300 and it is probably more than you'd need, but would be nice and fast and also fast for effects and had lots of RAM. Or for a more modest configuration, something like
HP Pavilion TG01-1160 Gaming PC; Intel Core i5 10th Gen 10400F 2.9GHz Processor; NVIDIA GeForce RTX 3060 12GB GDDR6; 16GB - Micro Center might be ok for your needs if that SSD is big enough (though I'm not a huge fan of HP as a brand, either).
There will also probably be some laptops that could work for what you need in the $1,000+ range of you want something portable and you may not care about it being very upgradeable (which is easier to do on some desktops).
Good luck.