BTC is considered the safest (grain of salt here because crypto is still incredibly volatile).
Right, just look at the price and the hype specially from institutions.
So I think something conservative portfolio would be maybe 80 BTC/15 ETH/5 DIVI (BTC/ETH/altcoin of your choosing).
I think that's not conservative when majority is into bitcoin, I would say that is aggressive.
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.
The opposite in my opinion. Hard to say which 3rd coin you will have to invest, but you can take a look at this 3: BNB, ADA and DOT.