BTC is considered the safest (grain of salt here because crypto is still incredibly volatile).
So I think something conservative portfolio would be maybe 80 BTC/15 ETH/5 DIVI (BTC/ETH/altcoin of your choosing).
If I want a more aggressive portfolio, I need to lower BTC holding, up ETH a little, and up your third coin? Is it a good plan?
With about a grand in USD to gamble. I probably don’t want to spread myself much thinner than 3 coins of course.
Diversifying is a good idea you only mention three coins as your option why not, widen your portfolio to include some DeFi projects like UNI or a coins that is showing strength like Binance coin, there are many coins that are candidate to get in your portfolio, just do your research and you will have a profitable and stable portfolio.