You shouldn't be concerned about the leaves for about another 10 years.
At the base you have a bit of a bulge happening which is good, as these have fairly tall straight trunks in the wild, with large buttressed roots at the base. When the swamp is in the dry season / low water levels, these trees looks amazing with the wide tangled roots exposed as well.
Of course it depends on what look you are going for. But if it was mine I'd be getting a lot of height happening on it with a strong leader, and let it grow for many few years in a grow pot. However if you are after a short thick tree, then go ahead ramify away. You can get good ramification on Swampies just by using the clip and grow technique. Don't be too tempted to continually cut them back though. They need lots of sunshine and to grow to remain in good health.
With swampies in a bonsai pot like you have, you need to be careful over summer / hot days that it doesn't dry out and die. They have the name 'swampy' for a reason
EDIT - Also, just noticed your collection of weeds in the pot.... Probably not a good idea, as these are going to suck the water out of the soil on hot days and the tree will be competing for water / soil.
