The Problem with buying and holding is to hope the project is solid and devs are really active on their part if not then you are in a top situation. I will recommend you research and watch the project attentively, know when to sell and when to buy
I think this is the best time for you to invest because there will be no chance for you to buy cheap. Today, the value of many coins has increased by more than 20% and ETH is mentioned because this coin is increasing rapidly in a short time. I advise everyone to consider buying some coins that are in the top 50 CMC because these are options that can help you make a lot of great profits.