You can start from the mwan3 guide. Apart from that it is not clear if you want to load balance or migrate the pbr rules or something in the middle. In any case the current pbr configuration would be helpful uci export pbr
I want to do all of it, basically I want the combined bandwidth of both of the wan interfaces but for specific services and sites I want those sites/services to use a specific interface for latency related concerns.
Alright, the example mwan3 config creates 2 interfaces, the necessary members, policies for load balancing, failover, and exclusive preference, and finally the rules for the traffic which will use a policy.
Therefore you only need to adjust the interface names to yours and transfer the rules from pbr to mwan3, assigning to a policy.
Ok well first of all sorry for the delay in replying, had to deal with some stuff IRL
So, can you like guide me? I would require step by step instructions on what to change and where to change, preferably within LuCI as I am not so familiar with command lines (willing to learn tho).