Xr500 or should i buy another model?

So let me first tell that i'm using an old d-link dsl-g256dg modem/router connected by a phone cable from my adsl adapter and a cat6 cable from the modem/router to my pc
My Isp is the "best" one in my area for pc gaming and im getting around 50-65mb download speeds and up to 5mb upload
I also have few home devices connected to my wifi while my pc is the main place for gaming and such (mostly apex legends and other fps shooters)

I'm getting "decent" ping to eu servers but dslreports show huge bufferbloat and bad scores+ i have a problem connecting some devices to my wifi..

I saw the Xr500 and got excited because it
Might be exactly what i need to get a stable better latency and fix the bufferbloat+ get better wifi range! Probably for the entire house
But i see it is a router only so i wonder if i should buy another model?
Or make my dlink a modem only and conmect it to the xr500?
Also - just wonder what can i expect for my pc gaming when i install this router? Does it really help improve my network? Or its just an expansive gimmick

Also- i know my isp connect my by pppoe and i have my user/pw but! Im kinda clueless when it comes to networking :))

Please let me know as i'm desperate to fix my network

Thanks