Android wallet Coinomi supports
many coins. But, it's closed source, and keeping all your coins in a hot wallet for long term is bad practice.
For secure storage, you shouldn't rely on just one wallet that covers all, you should research all coins individually, and choose the best wallet for each coin. I prefer to keep each wallet in it's own
VM.
Research, installation, backup and funding is quite a lot of work per coin. But, it also prevents you from just buying 100 random coins without having any idea what you're getting into.
You could make it a goal to buy 2 coins per week. That also means you'll have to research more than that, as you shouldn't just buy any random coin. This way, you'll buy 100 coins over the course of this year. If you're seriously going to do this, I would be very interested if you keep track of all your coins in a (self moderated) topic on this forum.