extend network

I use an RT-AC86U and don't get good signal at the other end of my house. What is a good option for extending the signal? I have read that buying a cheap asus router and using it as a node would do the job. I have VPNs and specific settings that I would like to maintain on my network, is this...

I have two Asus RT-AC87R routers, both are running Asus Merlin 384.13_10 Router #1 is setup as a normal router Router #2 is setup as a Media Bridge, my garage is unattached and I'm trying to get internet out there, its about 25 yards away from the house. Here is my issues, When I set up media...