It is likely you will need to go backwards a little in order to move forwards with a tree like this.
Developing ficus trunks and branches can be a lot like deciduous trees. Cut straight trunks and branches back to a side branch that gives better bend and taper, grow and repeat. fortunately most ficus are really good at growing back after a chop. A larger pot and plenty of fert should see it grow much faster to build your new structure.
For any multi trunk bonsai the trunks and branches should look natural ie not grow toward a larger trunk or in, under another larger branch. To that end you'll need to chop some of the trunks to a leader that moves out and away from the larger trunks nearby as a first step.
Here are some of my suggestions. As already mentioned, Take all advice with plenty of salt. Look at the actual tree before chopping as often what we see in a photo is not what's really there in 3D
View attachment 517540
Red lines - chop to remove - straight sections, too tall, growing toward other trunks.
Blue line - chop? Check where that trunk goes before chopping. Does it have a space to grow without interfering with other nearby trunks?
Pink arrow - Shorten the back trunk substantially - to reduce the straight section and to reduce height to leave the 2nd trunk right as dominant.
2nd right trunk - I can't see much of the structure. Look for a spot to reduce the straight parts (even if taht reduces the height to less than others. If that is necessary allow the replacement leaders to grow and develop back to dominant status.
2nd trunk from left - need to decide which way to direct the new trunk (forward, back, etc) Pick one dominant new leader that grows in the desired direction and chop the trunk to that. Grow and chop cycles to develop a better new trunk.
It will still take a few years to change this to a better tree but it can be done.