Hodling bitcoin for 4-10 years depends on how long you’ve decided to hold on to it. The main aim of an investment is to become profitable through it and if the profitability you can get from bitcoin investment within those few years you decide to hold them are okay for you, then you just need to work on your emotions to hold on through the market volatile nature because that’s what you can’t avoid as long as bitcoin is concerned. Emotions, understanding the market, patience are all part of the technique an investor is to learn to become a profitable investor in bitcoin.
Bitcoin is not about buying on dip and selling when it goes high. Through this approach you will just get a small profit. If someone want to get real benefit of investing in bitcoin then he has to invest for longer duration and create a strategy about how to invest in Bitcoin for long duration like 5 or more years.
If someone has huge capital then he can invest all at once and then wait for 5 or more years (Lump Sum investment). Not everyone has huge capital to go for Lump Sum investment, for such people best strategy for long term investment is DCA i.e. to invest a small amount every week or month. These investment strategies spread over longer period of time can give you good profit.