VPN Bandwidth Load Balancing

Hi Team,

I have three VPN connection for three isp network. We need to load balance the VPN connection when it reaches to a particular threshold for example 75% or 80% then the traffic need to shift to other tunnels.

For example if one tunnels is being used by 5 or 10 users and someone downloads or uploads a content then according to the bandwidth utilization is there any way to load balance the tunnel traffic to other tunnels.

Or is there any other way to load balance the traffic of VPN equally. If so please do let me know regarding this.

Regards..