Looking for an upgrade to my RT-AC68U with upgraded 9DBI antennas.

[Chris8topher]

Any sizable upgrades to it? Would like a more stable wifi connection out in the yard while mowing or doing yardwork.
Connection stays pretty good for about 30 ft outside the house and dies off completely at ~100ft.
there's not much obstructions.
I'm a bit of a novice when it comes to selecting routers and it looks like I got lucky with the RT-AC68U when I bought it.
Are there any commercial grade routers that would make sense in a residential setting?

Regards,
Chris

Edit: some more info;
I have a 60/5 connection.
Here's my antennas
And my router

 

[pege63]

Get a Ubiquiti Unifi AP AC PRO or a Ubiquiti Unifi AP AC LR Accesspoint that will fix the problem outside.

 

[avtella]

Increasing dBI makes the antennas more directional so less vertical range and increases horizontal range.