Autumn is a proven cheat client that can be used quite easily on absolutely any server. Just keep in mind that cheats are now really easy to use.
Autumn Hacked client for Minecraft 1.16.4 / 1.16.2 / 1.15.2
The functionality here is really excellent. As for the client’s appearance, there is simply nothing to complain about here either. It’s enough for you to use old cheats that have long lost their relevance. Even monsters like Flux are unfortunately not always able to work as well as this cheat.