From my observation, Hoya shooting star is the vining type, so it will not really go bushier, just keeps on making a long winding growth. You can use a self watering container, but make sure it is not too big. As with most Hoyas it does not like too big containers.
This is mine: right now it has two peduncles and both trying to make those umbels grow some more.
After each inflo blooms, it can easily throw away the umbel, and it may just grow a new batch on same peduncle several times. Sometimes it may just dry out the peduncle, but I do not worry, since it may just be redirecting new growth later to newer leaves and another peduncle.
This was how it looked like in early July 2019 when doing its intermittent blooms:
Closer look of older peduncle, just keeps on making buds as it likes. Eventually it wilted away, but it was a good journey of growth, kept producing blooms.