Sorry for your loss, it also happened me in past and I know how hard it is to take. Take lesson out of it, rethink strategy and try again.
I spot in your post this sentence:
When it comes to coins you really believe in,
Believe is feeling. Avoid believe.
Analyse and always doubt in your analysis.
Great investor Philip Fisher was always concern about his decisions, even after he bought company shares.
It may seem a little bit silly, but always worry, at least a bit.
We are investors we are trying to predict future. Lets not be childishly self confident in this hard art.