Not that I’m aware of. 

Many devices have a built in features to set data limits. android and windows have it. 

Is it a specific device you’re wanting to limit?

Back in April my upload increased significantly. So I would like to limit upload data to 1 gb or less as before April it never went above that. After  April it jumped to as much as 15GB daily. I am not savvy enough to see if a RDP has been deployed but after doing some research I suspect someone has secretly deployed one.

Dave

RDP? 

You can look at each devices data usage to see what is using the data. 

Remote Desktop Protocol (RDP) is a Microsoft-developed network communication protocol that allows users to remotely access and control other computers

The upload speed provided by your ISP may depend on the compatibility of your modem/router. If high data usage is affecting upload speeds, I recommend reaching out to your ISP for assistance.

For RDP, you can disable any port forwarding rules that may be enabled and adjust the firewall settings to enhance security. Additionally, I suggest updating your Wi-Fi credentials for improved protection.