First Select the service that you want to provide . Then research keyword on fiverr on your service . Make a fully optimize gig and try to rank it on that keyword . There are many things in between but These are the main step .
There is No specific holidays time duration on Fiverr . But I have seen most of the buyer are from western country's . So as a result I have seen buyers are not much active during Christmas Holiday time .
When You Set your Gig Price it automatically selects your local currency . But when someone from like US visit your gig it Automatically Converts your package price to USD . Hope it Helps .