Why not just focus your investment in two equal ratios like putting the half in btc and putting the other half in fiat or alts. So that you'll gain more when bitcoin price surges up which we know is going to come eventually. If you have invested all your money in bitcoin than your gains would be lot greater than diversifying it into small pieces. Anyways that's only my opinion.
Best thing to do than having an ALT. Some if not most of the traders are only trading with BTC/USDT and they only consider BTC to be the only coin that matters in crypto. Having all those alts you hope to go up might just give you hassles in the end when their transaction validation takes time. Bitcoin confirmation already is a hassle which can delay and cause loss.