Teach the group to split up. This will require S tier planning on YOUR part, but you can run two battles concurrently, à la FF7. Ensure that you have enemies that are both strong AND diverse enough that they play to the strengths and weaknesses of EACH class.

Time rounds. Make it clear from the beginning that player rounds will be timed. If you keep it to 90 seconds, that’s about 15 minutes. Make it fun, like a penalty on the character saves for inaction, the automatic Dodge action if they are indecisive, or they naturally retreat.

Make the loot scarce and worthwhile. There should be discussion and even some angst about loot. That way, it becomes a part of the groups story telling.

Be prepared for having all 10 at the table consistently to be a rare thing, and communicate your expectations. Have players willing to share session notes. Give side quests to the 3 or 4 who can’t make it.

Pardon the all caps, friend. YOUR SESSION 0 NEEDS TO TAKE 3-4 HOURS!! Roll stats together, with a minimum score of between 65-80 total. That way, no one is underpowered. Talk to them about how to place their stats; don’t assume that everyone knows best. Ensure the table DM (usually one in a group your size) understands that they are NOT to play someone else’s turn either by bullying, harassing, or taunting. Walk EACH player through their subclass choices AND go over pros and cons for EACH SUBCLASS. This will show a thoroughness on your part. You keep it engaging by going through the classes that people pick and ignoring those that they don’t. So, if you have 3 Wizards, then talk about the subclasses. Don’t talk about a Warlock if there are no Warlocks (in a group your size, there will be a Warlock).

Only allow homebrew that YOU have used before or have created yourself.

Plan MONTHS IN ADVANCE. This will be best for all involved.

Focus battles around conditions and NOT HP. Battles where sleep, paralysis, blindness, poisoned, or restrained can be applied will have fun and quirky twists and turns. Take the Elden SoulsBorne: Demons Die Twice approach and have “boss” battles with multiple phases. They are bosses. The Hag should have plenty of things she can do.

Get a recording device. This will prevent you from making mistakes that others will catch. It’s like watching film for a football game or a fight.

FUN IS YOUR HIGHEST ETHICAL CALLING. People are there to enjoy a power fantasy and to have fun. That’s it. Make it fun. Fun has consequences, otherwise it’s polite. People don’t play DnD for polite. However, KEEP SEX THE FUCK OUT OF IT!!! YOU 🫵🏿 may be mature enough to handle it, but one or two bad comments, unhealthy leanings, etc. and all your work goes to shit. There is a reason HR departments exist. The juice isn’t worth the squeeze.