I consider 400k impossible (virtually). To good to be true. I would be really happy reaching 50k in two years (max time I plan on holding btc), and would conform even with 20k. 100k would be a dream, but I know deep inside that I would shit on my pants everyday at night if I dont sell at 60k or 70k or whatever, so doesn't matter....
You could plan to keep at least some
BTC, also sell on rallies and buy on dips, that way you will still own a bit if the prices go way beyond $100K.