There are a few options from the school of Enchantment that should keep the theme.

I am listing first level spells first. I would recommend allowing the Yuan-ti to cast them at 2nd level to keep the power approximately the same as sugestão.

• comando cast at 2nd level - this will target 2 characters, but will only last 1 round.
• Pessoa de charme cast at 2nd level - will also target 2 characters, but they will have advantage on the save if they are fighting the Yuan-ti. This may be the most on theme for Yuan-ti.

2nd level spells:

• Encantar - this spell might allow one Yuan-ti to act as a distraction while others sneak up on the party.
• Coroa da loucura - although it is also 2nd level, this spell is slightly more powerful as it would allow the Yuan-ti to each take control of one of the PCs.
• Emoções calmas - This can be used either to temporarily end hostility from enemies or suppress charm/fear effects in allies.

Keeping the table happy

The important thing to note here is that casting spells that take away player agency is almost always going to be a problem. The most important thing is to not present your players with something that will go awkwardly or make them feel like they aren't in control.

Don't put them in a position where you are taking their player agency away. Give them an opportunity to do some interesting things with roleplaying charmed, but they shouldn't feel like you are owning their characters and their choices. If you do use enchantment spells that pode do this (sugestão, pessoa de charme, comando, coroa da loucura, etc), you need to be really careful about how you do it. Command is a bit simpler because it's just one turn, but you've taken your player out of play for that turn. The others you need to be very careful with as well so as not to think you are in control of their characters.

Perigos de sugestão e similar

These spells aren't dominar pessoa. Mesmo sugestão stipulates:

The suggestion must be worded in such a manner as to make the course of action sound reasonable.

If you can't make a reasonable case, then what you're asking isn't reasonable. Coercion isn't reasonable. Reasonable is something that the character would say to themselves "Yes, this action seems completely reasonable for me to do as if I was choosing to do it myself."

And you've only got a sentence or two to make your case. It's not easy! And that's where the spell is limited.

Aqui is an excellent Q&A on figuring out what's a reasonable suggestion.

sugestão may be perfectly fine to keep with your Yuan-Ti, but you may need to approach how you use it differently.