My recommendation, first being the best:

• lemm.ee
• sh.itjust.works if you are ok with the name
• discuss.tchncs.de or lemmy.ca depending if you are located in Europe or North America
• lemmy.zip as they are good contenders, but a bit smaller than the others

If you don’t want downvotes (which can be quite liberating), Reddthat.com is a good choice

All of those instances are well managed and transparent with their updates, administration and cost.

Lemmy world is okay, but they are already very big, so it’s better to go to another one from a decentralization perspective.