It's hilarious how 99% of the recommendations are for shit coins with nothing going for them except pump and dump. This *might* be ok you're a trader looking for a quick buck but it's horrid advice for long term investments.

For this you should look at what the altcoin is bringing to the table, what problem does it solve?

I would argue that Monero is a solid candidate. It's the only fungible cryptocurrency giving you actual privacy. This is a very real problem no other coins solve satisfactory.