That Mikrotik switch must be heating up like crazy if you fill all 4 ports, since it's using copper .

How about this one? https://mikrotik.com/product/crs305_1g_4s_in

You can use fiber optic SFP+ in it which should not run as hot.

Run fiber everywhere for the fun of it, instead of copper Ethernet. Here is an interesting post about it:

https://sschueller.github.io/posts/wiring-a-home-with-fiber/

You can simplify it and avoid splicing which is the most complex thing about it.