Do you think I make a good choice this year or I should include BNB so that if one is delaying me in the market, I can try the other one to achieve what I want .
ETH is quite satisfying but some altcoins do good as well like BNB, Matic, etc.
You can buy more coins at your preferred but I would say you may focus more on the ETH than others. Allocating 60% to ETH and 40% to others is a fair decision for me. At least if ever I lose on other altcoins, I already secured more than half of my capital which means that it is still possible that I can recover losses.
Anyway, choosing ETH alone is definitely a good choice and many investors did this. Besides, ETH is the most promising altcoin in the market, with less risk and surely a profitable investment.