With regard to the question as to when you might see results... the pattern with multifloral paphs like this is that one year they produce a new growth (new fan), the next year the new fan produces roots, and if you are lucky and the plant is healthy and mature enough, the third year might produce a flower from the new growth. But if it just makes more new growths, that is good too because to bloom these need to get rather large and robust. You may have to wait awhile for new roots. So take care of the ones you have even if they don't look wonderful.
Use sugar. Don't substitute. I think that the mechanism is to raise the osmotic pressure of the water a little. And the sugar might even give the plant a bit of boost.
Don't remove any roots. Even a bad root is better than no root (can help hydrate the plant) and especially with Paphs it is hard to tell which roots are bad.
Oh no i hv removed most of those hollow root. Now the plant's root look like this.
That division looks big and healthy. You can hope that it has enough reserves to start new growth. It is important that you keep it in a humid environment, to reduce water loss since its ability to take in water is so badly reduced.