If you were going to invest in both BTC and ETH what percentage would you put into each? At the moment I have 100% in BTC but am thinking of diversifying.
At this point ETH price is much higher probably due to some upcoming events. So this is not the time to buy. Wait for the next big drop in price and then buy ETH, if you are looking forward to it. Personally I bought back in 350$ range and I would only sell at such high prices instead of buying. Not that it will not be big in future, but I prefer to keep Bitcoin in 95% of the portfolio.
Are there a couple of others that you would suggest should get some of that percentage, such as DOGE or something else? If so, what percentages?
Definitely not that meme shitcoin. Also a new red flag on Doge is that Musk became involved with it. Musk has previously made a nice pump and dump on bitcoin and now he is going similarly to DOGE. If you already own doge, this would be the time to sell, once he pumps it. Rest is up to you to decide what to buy.