38 degrees Celcius is a little high, but not necessarily bad per se. That equates to about 100 degrees Farenheit, which is only slightly higher than the high end of the temperature range generally considered to be safe for laptops. Software-based fan control can easily lower those temps to the safe range.
Does your monitoring software include manual fan control? If not, consider purchasing Tunabelly Software’s TG Pro (on sale for $10 right now):
https://www.tunabellysoftware.com/tgpro/
TG Pro also monitors temps and it allows for manual fan control so you can override system defaults. You can use it to ramp up the fan RPMs a little and bring temperatures down. (Note that this may increase audible fan noise, proportionate to how much RPMs are increased.)
Consider also that SSDs typically have very, very low power requirements, and less electricity = less heat. So under normal circumstances the use of an SSD should make computer operation more efficient overall because SSDs use less power than traditional spinning hard drives. Because of this, I wonder if it wasn’t the usage of the computer at that time (i.e. “heavy use” for about, what, half a day?) that caused the heat to rise. Laptops are notorious for their lack of efficiency in dissipating heat, due to the tight space inside the case. Some laptops handle heat dissipation better than others.
I’m inclined to think there’s not a problem with your system, but rather the issue lies with the nature of laptop thermal dynamics combined with heavy usage. Try the software fan control method and you’ll see the temperatures drop.
Also, there are laptop trays that have built-in fans to blow cool air up to the laptop from underneath. They are readily found online at any number of retailers.