If you are a long term holder, then don't watch the peaks in the graphs, but watch the trend of the low points. That will give you a feel for the true prospects for the price.
Better yet, if you are looking at price trends on coinmarketcap, then you should a) look over all time, and b) switch the chart to log scale.
This will help to give you a better understanding of price movements.
The reason I advise to switch to 'all time' is to smooth out all of the short-term noise and volatility.
The reason I advise to switch to log scale is because we have seen orders-of-magnitude price changes over the years, and if you use a linear scale then historic price changes are smeared out to a flat line, which doesn't help to give you perspective. But using a log scale reveals the historic movements.
The two approaches combined give what I think is a decent picture of how the price has changed:
Now this should give you a
starting point in determining what you think bitcoin might be worth in a few years' time. There are then a huge number of other factors to consider, such as changes in adoption, changes in use case, regulatory positions etc. The short answer is everyone is guessing as to future price. All that you can do is decide for yourself what you think is most likely to happen, and then buy/sell accordingly.