I think you must hold your bitcoin bro, because it is more valuable rather than eth. As we see condition of the market, btc and most of altcoin still decrease but the price of bitcoin still affect for another coins. As we know, btc still the top in the cryptocurrency, so if you want invest in eth too, you can do that. Just sell few your btc, but still hold and keep your btc because i really sure that the price of btc higher and can give more profits rather than eth.