Upgrading wifi signal/speed

[cj29]

I am working from home and am currently using the Nighthawk AC1900. I had to buy another one b/c mine just died after a storm here on long island. I have my router upstairs however im working downstairs. 

I still lag with the internet and speeds are so so. Im at a complete loss of what I should buy. I have verizon fios and i am going to be upgrading from 25/25 mbps to 200/200.

Can you recommmend which product would be the best option for me since i work from home and need to connect via wifi. Too many choices. I was reading about the orbi mesh. I want this to last a few years so im not in this position again.

Thanks for your response

Sincerely,

Cheryl S.