When you have low budget, you don't have any business with many coins. Just buy one coin and leave your faith to that coin and if it grow well with profit
That's not a good strategy. You always diversify your investment funds, no matter the amount of them. It's better, in any term, to put in 10 different assets $10 in each asset, rather $100 to just one.
There is no strategy that can be used in every single scenario, diversification makes sense if you already have a high level of capital, but for someone with just 100 dollars in their pocket, it makes no sense to invest in 10 different assets dividing their capital equally between them, just think about the fees you will have to pay to move your coins, and if we add that during the bull run the transaction fees goes up, it is even likely you could not move those coins as the fees are higher than that, so in that case, investing those 100 dollars in a single project makes more sense.