Check the most recently published quarterly book per share. When the P/B ratio drops below 1.35 sell some BRK stock and use the proceeds to buy long dated deep in the money BRK call options. ... Then, next time the stock trades above 1.55 times known book per share, take the profits on the calls and use all the proceeds to buy plain stock again, ditching the leverage. So, you're invested all the time, but pile on a little leverage when the outlook is particularly good. It's much like your switch, but instead of switching between BRK and something else, you're switching between BRK and more BRK.
Do you mean by BRK Buffet's Berkshire Hathaway (BRK-A)? One single stock share costs "only" $597,392.50 How can you afford that?
%% Class b; is in SPY, Vanguard 500, MS holdings, Fidelity 500,SCHW 500,Bill + Melinda Gates Foundation, XLF/ 0.88% to 11%. That's the cash stock, not a stock or ETF tip