DELL Inspiron 7447 wifi network problem

I can't find or connect to my usual wifi connection even though other devices in my house can

I can only find a one bar connection to the wifi connection i usually use, somethings 2.4G would show and other times 5G would show but I cannot connect to them. I cannot see any other networks but there are around 8 other networks near my house that i could detect from my mobile phone. The only wireless connection I could connect is the wifi hotspot I share from my phone but even that wifi connection only get 2 bars maximum despite my phone being literally next to my computer.

I have been noticing my computer randomly disconnect from my wifi and reconnecting a while later and that the time it takes to reconnect has been getting longer but today, i just can't connect to my wifi anymore. I am using my computer from the same spot and every other devices inside my home can connect to my wifi.

My wireless network adapter is Interl(R) Dual band Wireless-AC 3160.

I have tried every solution I could find online and I will list them below.

• Turning my wifi on and off
• Disabling and enabling  the network adapter.
• uninstalling the driver for network dadapter and reinstalling one downloaded from dell official website.
• turned off "allow this computer to turn off this device to save power".
• made sure WLAn autoconfig to have "running" status and "automatic" start up option.
• restarted my computer 5+ times.
• Resetting the computer network settings
• I also followed every instruction "the troubleshotting wireless connection Dell" video except reinstalling/installing my OS system because i don't want to delete my files 

This problem is very frustrating as I can only find very little help online and every solution I found so far didn't help. Please help me find solution to this problem as I have to attend my online classes for my university. Thank you