Ya sometime we are looking for High speed . LTE ? DSL etc … each has technology has it own limitation . and sometime you would like to load balance your traffic between multiple ISP ! .
DSL good for gaming , but bandwidth limitation ! . LTE might give you good bandwidth but with latency ( not suitable for gaming ).
what about if you would like doubling your bandwidth . ya might work
now there are many affordable multi wan or Gateway load balancing routers . yes they become cheap and really provide advance features .
you can utilize those boxes to expand your bandwidth , or choose which apps/server utilize which ISP . the beauty also some provide you with statistics that if you run this app let say youtube it will be much faster in ISP 1 , more than ISP 2 . having latency monitor + bandwidth gauges
I would recommend peplink – nice product and it do the job . you can order it from amazon or any online shop . link here
if you want a simple and cost effective one . you could also consider TP-Link gateway LB . its available in Kuwait from Burhain Tech in Huawei .