I live between Chicago and Milwaukee, normally the great frozen north (not this year, yeah! there is an up side to global warming, love the mild winter). I grew a Clusia rosea for about 5 years before moving it on to somebody else. So my comments are from ACTUAL EXPERIENCE, not Internet conjecture. Clusia is NOT a good houseplant. If you live in south Florida, its easy to grow outdoors. But in the north, it is very difficult to keep happy indoors.
Clusia rosea is a true tropical. Temperatures below 40 F can damage and even kill the tree, even if it doesn't freeze. In Ecuador, it is often found as an epiphyte - it grows in trees like an orchid or a bromeliad. It has very thick roots, it wants a very coarse potting mix. I actually used an orchid bark potting mix. For a cutting I made I used long fiber New Zealand sphagnum moss. I watered the orchid mix about every 5 days. It would be dry on the surface, and barely damp in the base of the pot. They like to go from wet to just about, but not quite dry, fairly quickly. Inert, mineral bonsai soil mixes, and regular potting soil are too fine, roots will die in a few months. The mix needs to be soft and airy. Very fluffy peat based mix can work too. Roots don't branch much either, to in addition to being thick, they do not ramify. You will always have to use a pot that is "too large" for bonsai to contain the roots of Clusia. Really a weird plant.
They like very bright shade to 4 or 5 hours of direct sun. Humidity (a separate issue from watering) needs to be above 50% or the roots won't be able to pull in enough water to keep the plant happy and growing even if the roots are wet, in low humidity, they can't move enough water. Temperatures, they like warmth, 70's to 90's is the ideal range, they will tend to sit dormant if temperatures are cooler than 70.
I grew mine under lights, with my orchids, in my rather elaborate light garden. In winter my light garden temperatures tend to run between 60 F and 75 F. Usually too cool to get much growth. The leaves are large, the trunk stays thin, the roots can be larger in diameter than the trunk, the growth pattern is very angular. And the relative slow growth I was getting, all caused me to decide to sell it off after 5 years. Generally I would advise against Clusia as bonsai, unless you could use it for a 36 to 60 inch tall tree, and had a tropical greenhouse in which to grow it. Or you lived south of Coral Gables, Florida. They would grow well outdoors in Homestead & Redlands, Florida. Generally, its growth habits are not at all what you would look for in a bonsai. They usually don't flower until the plant is older. In fact mine never was happy enough to flower for me. It is simply not a good species for bonsai. If you want a flowering bonsai for indoors in the winter, try trees like Serrisa, Nashia, citrus, jasmine, gardenia, Vireya, bouganvillea, and others. Azalea, pomegranate, gardenia, are sub-tropical, and need a cool rest to get blooming initiated, but they can be grown outdoors, & brought indoors after they have had their cool rests. Bouganvillea, normally won't bloom in winter, usually spring, summer or autumn, but in my light garden, mine will bloom about 4 or 5 months after pruning. I usually prune in August, so it tends to bloom in January for me. But my light garden is brighter than most peoples indoor light set ups.
Just looking at your tree, I'd say its dead. Likely it got a fatal chill in shipping. Try to get your money back. Though the vendor does not have a good reputation for issuing refunds.
