First, you need to set a profit target for a project that you believe can offer better returns than BTC, ETH, BNB, etc. You should allocate some of your idle funds for investment, and the amount you invest in low-cap altcoins is typically smaller compared to what you might invest in BTC, ETH, BNB, and so on.
Your question is quite absurd, and I can't provide an accurate answer. Of course, all the opinions given are for reference, but with the five projects you've listed, you would receive a large amount of feedback, and I believe it wouldn't be of much use to you. You'll still have to research and make your own decision. You know, you can't make an investment decision by asking a question like that on a forum.
Regulatory bodies are aware that cryptocurrencies with built-in privacy technologies are difficult to trace. Consequently, limitations are imposed to discourage the wider adoption of such cryptocurrencies, like Monero.
Moreover, cryptocurrencies are designed for specific purposes. Those who value versatility and innovation tend to prefer smart-contract-focused cryptocurrencies. It's evident that some individuals conscientiously prioritize their privacy, making Monero a suitable choice for them. Each coin serves a distinct purpose, and users are at liberty to select what aligns with their needs.
Given this, popularity shouldn't necessarily be a significant factor to consider.