Onc. Heaven Scent is an offspring of Onc. Sharry Baby, so likes bright light (but not direct sun, or those thin leaves will burn) and reasonably warm temperatures. The potting medium needs to be quite airy, as the thin roots prefer to really breathe. (Based upon your question, I guess you're not an experienced orchid grower, so keying on root health will be a new focus for you.)
The pseudobulbs should be plump, with at most only a bit of wrinkling, and they and the leaves should be a medium green in color.
In order to "get" any orchid to bloom, you need to provide it with the right growing conditions, water, and a decent fertilizer (not a high-nitrogen formula) on a regular basis, and then wait for its bloom cycle to roll around.
In the case of that type of oncidium, they tend to bloom as new growths mature.
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