How to Speed up RELAY transmission ?

Because my internet is Symmetric which can’t support p2p udp make a hole. i ask others .i can’t change my NAT type. i can’t use zerotier to p2p.it’s so sad. but i can use relay.
My big problem is relay speed is slow . i build a moon and build a own planet to relay in cloud server . but it always is in 500kb - 1 M/s.i can’t see movie smoothly.so how can i speed up relay speed?
this is ping in lan with other device
O3Z085MWN{QCSC9{WG@857