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One possibility is changing your HSRP to mHSRP. I.e. instead of just one virtual gateway, e.g. .1, you have two virtual gateways, e.g. .1 and .2. Each router normally has one of the virtual gateways active, the other as standby.
Another possibility is to use OER or PfR between the two routers. Unlike the mHSRP approach, which does static load balancing, OER/PfR performs dynamic load balancing. (NB: both can be used.)
Don't believe there's a way to bond links between two or your routers, to two different providers.
