Well I don't think that it would be a good move. You should try holding your bitcoins as the chances for bitcoin's price to grow would be far more than that of ethereum. Also, if bitcoin grows, it would be growing far more than that of ethereum because of it's popularity and demand which are far more than eth. So I think you should keep holding.
Sometimes to be honest, just keeping on holding is not the best option at all. You need to let go your investment (especially if you invested during the wrong time). This way you will be able to cut back some losses and save yourself some money. Another reason to sell is that, your current investment may cause barriers to future investment which might have better potential to make profit than your current investment.
Maybe transferring to fiat or USDT and get back when it's better, but who don't know what is doing maybe it is better to stay in the same position.
Ethereum is falling too these days. Just think twice before moving investment.