Are you safe in your investing? Earlier this year you have a gain of 800 000 USD and no tax. And let it now go down to 400 000 USD. I don't understand.
400k $ with medioker investing interest during 7 years would have been Year 1 400k x 10% =440k Year 2 440k x 10% = 484k Year 3 484k x 10% = 532k Year 4 532k x 10% = 585k Year 5 585k x 10% = 644k Year 6 644k x 10% = 708k Year 7 708k x 10% = 779k And if i do the same with your actual stake the gains will likely be higher and easy to accomplish at a considerably lower risk If you apply same math with interest at interest but stake put in apple 7 years ago you might feel rather lousy investing perhaps? :-)
Taking away gains from Exchange rate appreciation your result in absolute terms during period would be 0 likely...