Changing swappiness can certainly help, as well as considering the type of applications you're running within your system capabilities.
On a system with only 4GB RAM, you have very little choice but to allocate some swap space. However, just be aware that if you "chose" to suspend/hibernate alot in addition to running programs that constantly fill your memory, you run the risk of eating up a SSD drive more quickly with consistant extra writes. That may be the reason your disk health is at 76%.
That said, 4GB RAM is plenty to run a basic usage UM system on without putting the pedal to the metal all the time.
If you're experienceing that, you'll eventually have to adapt your computing habits and/or upgrade your hardware.