Advice needed for new investor

Hello, I'm completely fresh to cryptocurrency market, so I wanted to get some advice. I wanted to try investing in crypto market, since I don't have knowledge about other coins, I bought Bitcoin for around 24€, it has seen ups and downs through out the week, however they weren't that noticible as it was falling or rising by 1-2%, today I was suprised to see Bitcoin increase in around 7-8% in price and my portfolio is around 26.50€ worth now, should I sell it now and wait for a rapid drop to lower price, then rebuy it, or wait for a pontential increase in the future and hold it? I'm using Kraken by the way