Bought YTLPWR-WA 0.50 long ago,any idea to sell or hold?

It's depend on trader appetite. If you think the price now soon will drop, it is better to sell and realised the profits rather than paper profits become gone. From political uncertainties point of view, it will affect local market performance. Market trend will up once these uncertainties become clearer.

There is one method trailing profits where you sell half first and keep another half for stock trend to up(depend on market mood).
But need to set cut loss price. Once broke, then it is adviseable to sell all remaining shares.

(Note: it is just my 2 cents opinion. buy/trade at own risks)