You are right that altcoins always pump hard and late in a bull run. Investing in Bitcoin is considered safe, but the rate of return on Bitcoin is lower than Altcoin.If one chooses good and strong market coins to invest in, which have the potential to give a good profit in the future, then surely good profit can be earned. your suggestion is very good that crypto currency market is a fluctuating market, invest here the money that you lose will not affect your daily matters. Always diversify your capital among different altcoins. Investing in a single altcoin increases the risk of loss.
You can start the bull market by first investing in Bitcoin and wait until Bitcoin gets it own bull run, when that happens you can take the profits from Bitcoin and invest in altcoins. You can make profits from both bitcoin and altcoins because they pump at different times. Altcoins pumps very late in the bull market because all the attention will be on Bitcoin and other top coins.
Altcoins pumps in different stages, first the top altcoins like those in the top 20 position will pump and those are coins like Ethereum, BNB, Litecoin and other coins that aren't seen as a high risk investment. After then will smaller altcoins pumps, these are altcoins with very small market capitalization and this is when the altcoins bull seasons starts fully because you can make profits.
During the altcoins bull market, investing in anything in the cryptocurency market will be profitable. During this period, you can make 2x in a day, coins can rise by 1000% in few weeks. Altcoins bull market makes investing in the cryptocurency market look very easy and this is when scams are too many as scammers will be looking to scam investors that aren't well experienced.