I will take this as a genuine post. You shouldn't be investing...

I will take this as a genuine post. You shouldn't be investing with any money you cant afford to lose if you need advise from a forum of whether you should buy or sell. In my opinion trading short term is akin to gambling especially if you have little or no experience or history of consistent success based on a sound strategy.
I only invest mid to long term. Basically unless I think the company has potential for years to come I won't buy it. That is the mindset you need to make long term gains.
Specifically to your question, no one knows where the short term price will go. I am confident that in a year from now if all goes well (Webjet doesn't need more money), the SP will be firmly above $4 and it will be above $6 another year after that. People's sentiments change quicker than the weather. A few days of bad headlines and people on Hot Copper will be back to talking about the SP reaching capital raise price ($1.7) and a few days of good news and people start talking about $6 per share. No one can tell you what's best for your situation (buy more, sell or hold) but I think if you have a long term view holding Webjet as part of a balanced portfolio (say max 10% allocation) at current prices is probably a safe move and provides a good risk reward ratio.