Router losing connection; pretty sure b/c too many networks in the area

for some reason over the past month or so, the wireless networks in this area have increased from about 6 to about 15-16 sometimes. in the same amount of time, my router has become complete shite and loses connection constantly.

is there any way to combat this issue? shittier router with less range (which would frick some access upstairs)?

i have connected every possible device at the 5 GHz range and very few are on the 2.4 GHz range within my house. it worked for a short while but then stopped