HODL is of course a crypto generated term, which just means saving. In this market for many it also means not trading what you have... which is prudent for most that do not know (really know) how to trade well (myself included).
However rich people, do not get rich saving.... the get rich from investing... which means they keep accruing investments, be it from profits of other investment or by constantly adding new funding.
I have traded (both well and not so well) so I mostly accrue from HODLing and New Fund allocation.