Dual WAN for Dynamic Bandwidth WAN Connection

I want to configure dual WAN in my Mikrotik router.

I have 2 WAN. WAN-1 is dedicated/fixed bandwidth of 1Mbps and WAN-2 is 1Mbps shared. Since I do not have fixed bandwidth in WAN-2, I cannot use PCC. So could you please suggest how should I configure my dual WAN so that it switches between the WANs based on bandwidth consumption in each WAN ?

And of course, I want to utilize both the WANs 100% to utilize the full bandwidth.

Thanks in Advance.

what you are trying to do, my clients request it to many times.

There is not a simple solution for this problem, maybe monitoring performance with script and making load balancing changes continuosly

The other way is build and aplication via mikrotik API to monitoring and making changes all the time.