Slow upload speed: 35Mbps vs 200Mbps (plan)

Hello,
 I am on Gigabit Extra Plan that promises Download speeds: up to 1200 Mbps and Upload speeds: up to 200 Mbps. I own Motorola MB8611 modem + UDM Pro. I am getting 1200-1300Mbps and only 35Mbps download speed. How to fix it?

Regards,

German M.