We should buy Bitcoin for the long term, and put a lot of effort into it, people succeed because of hard work! So we should be careful when we buy Bitcoin for the long term, sell it when the price goes up, then they can make a very good profit
Your comment should be clarified, first you commented that we should buy Bitcoin in a long-term plan, then at the end you commented that we should buy Bitcoin cautiously and sell Bitcoin when the price of Bitcoin increases. If we have to sell Bitcoin as the price increases, then please clarify here how it is a long-term investment plan. We actually do not know what we mean by long-term investment, first learn about investment and then learn how to invest in Bitcoin in a long-term plan. Those who invest in a long-term plan do not really think about selling, rather those investors think about how they will increase their investment further and how they will ensure continuous investment. If Bitcoin is bought at a low price and sold at some profit, then it can never be considered as an investment, rather you can consider it as a small profit trading.
For a clear idea about investment, you can read the various discussions in this section carefully, especially you can follow the suggestions of JayJuanGee, by doing this your idea about investment will be clear.