Decentraland (MANA)
The Sandbox
Axie Infinity Shard (AXS) and likely RON token(soon to be launched)
Gala
Enjin Coin
I think in terms of popularity and potential. These are the ones that I've collected and I have on my list but I may not invest in all of them and only a few of them since there's an issue with budgeting.
You have to do it at your most comfortable time and when you're not struggling financially so you can buy within your budget and you've got plenty of spares to spend.
That's just based on what I think so I ended up with that list. I guess there are also other metaverse projects that others are finding out and it's all up to you guys if you're going to buy them. Just make sure that you make your own research before the purchase.