Currently, if you want to buy any altcoin, it is very difficult. You can't choose an option quite easily. Also, the crypto market is currently volatile. In such circumstances if one wants to buy altcoin. So what should be the main focus?
myself, my main focus when I want to buy some altcoins is; what I noticed first was the altcoin platform, then who was the developer and the team that supported the growth of the altcoin, then I saw the movement in the market, if it has good potential then I will invest in that currency
I was always seeing if the developer behind the project actively growing the community and partnership with other popular projects. partnership will help the project either for short term and long term, also whether the project gets listed in a popular exchange too or not. Most of the project that have become successful mostly get listed in a popular exchange because it also helps them growing their popularity.