Now implementing this strategy is the most ok, because the current BTC prices are very low and can fall deep, so buy them now do not miss the opportunity.
buying btc is good but selling alts this time is not that good because the price is also low you can sell it but with a low value so it is better to hold it and buy bitcoin form your fiat but if you got nothing you can sell your alts because the chance you can earn with a good value is on the side of bitcoin.