I switched to Verizon 5G Internet earlier this year, and today it's providing 298.70 download and 20.74 upload.  Not as fast as the cable connection I had, but fast enough.  That's at home; at my office I have AT&T 5G Internet, which is somewhat slower but not noticeably.  My backup, which I have not had to use, is to link my Verizon cell phone to the computer, with Bluetooth.  What's your cell phone connection speed?

You have a new computer, but how old is your modem?    I recall reading a while back, if your modem is more than three or four years old, it's time to get a new one. 

If all else fails, I just read that 250,000 Brazilians are using Starlink for Internet access.  Call Elon Musk, problem solved.  As long as you have $120 a month.