Considering how it looks, I don't really know what to advice. It can be hard to keep these alive even if they are in prime health. You can remove the flowers, yes, so it needs less water. I would also put something on the roots so they are covered. Either your potting mix, peat, fine pine bark, or sphagnum.
The stakes to get them to move further away from each other seem kinda pointless. You can repot them at a different angle in the future. Getting movement in the first part of the trunk right now is kind of impossible. They get too brittle too early.
But I kind of want to say that you shouldn't invest too much energy and emotion into this plant. I would rather tell you to go to a different shop and buy a nicer one with proper health. Inspect the 4 trunks for movement and bonsai potential. And if you find one pot that has 1 with potential, buy that one. Then prune away the other 3 trunks to nothing, cut wedges in the root ball, and plant it in your garden in a spot with afternoon shade. Make sure it has well-draining acidic soil.
You can try to keep this one alive as well. But that is less than ideal. So I kinda feel bad trying to give the best advice, since the results may be disappointing even if you give it the best care.