Bed adhesion is usually the biggest issue, often attributable to the z height being off, and a lot of older printers didn’t have z-axis sensors or the software to accommodate for the variances, so it involved the old paper test. Depending on the printer, it might shake itself out of its z height setting while printing. A lot of people ended up spending as much as the cost of their printer upgrading with after market parts to try to resolve some of these issues.

I haven’t used the Monoprice before, but my research says that Monoprice doesn’t make their own printers. They just rebrand someone else’s. So the Monoprice Maker Select appears to be a rebranded Wanhao Duplicator i3, which looks like it came out sometime in 2016. So while you might have bought it six years ago, the actual printer design is much older and missing out on possibly 9 years worth of innovations.

If you can eventually afford to replace it with something else, there are some sub-$400 printers out now that might give you a much nicer experience. I started with an Ender 3 v2, which was a pain, similar to what you experienced. I upgraded to a Sovol SV06, which was great (and recommended to me by a professional with a print farm and wide variety of printers). Now I’m on a Prusa CORE One, but I don’t recommend spending big until you know you’re really into 3D printing. If you do consider buying a newer printer at some point, I’d recommend seeing if you can see someone else’s in action so you can experience the difference. Makerspaces might be a good resource for this.