as a long term investments, you can consider it long term only when you've sold it, waits for it another periodic cycle after heavy dump, buy back for long term.
That is it seems to me one of the big differences between gambling and investing.
If you truly are trying to invest, rather than merely gamble, try to think in terms of yourself being one of those other people whose efforts folk who buy "securities" are relying upon, according to the "Howey test", to increase the value of what they purchase.
Of course if what you are investing in is not, supposedly, a "security" according to the "Howey test" it is all the more important to think in terms of your own determination to see that the thing does actually go up in value being what is going to turn the thing some day into something secure, because you are going to be among those securing it.
Another thought
experiementexperiment that can be very useful is to think of being a retail coin-dealer at a flea market or wherever, you are thinking of entering the coin business, you want to be a reputable dealer, so think in terms of "money back if not satisfied (minus a small re-stocking fee of course)
" by placing buy offers sufficient to buy back all that you sold, minus of course a small "re-stocking fee" known as the "spread"...
-MarkM-