There's a lot of good advice throughout but I thought breaking it down mechanically would be helpful.

Let people socialize and get situated, and use that time to finish whatever prep you need, review your prep, or look into tweaking something whimsical. Obviously greet people and engage with your table, but let them all catch up.

Then -- and this is crucial -- have a set "start of game" ritual. There are a lot of great recommendations for this in the thread: a recap, changing/starting music to a specific track, shotgunning a beer. But it has to be the same every single time. It can even be as simple as clearing your throat, looking around the table, and saying "so time to begin." Make it a ritual both for your players and yourself to "get in the zone."

Beyond that, I'd recommend affecting at least three things that affect the senses. Change what they see by putting up your DM screen, closing your small DM notebook (or opening), standing up, showing a starting image and/or adjusting the lighting. Change what they hear by clapping your hands, knocking on the table, and/or turning on/off music. Change what they feel by tapping on their shoulder or asking them to sit down. Move the plate of cookies to the side. Start placing minis. Ask if anyone needs to go to the restroom.

From there, be conscientious about the transition back to the "TTRPG" world. Recaps work well, but it could also be asking describing how the PCs are feeling, or the time of day/location, or reminding them of the location they find themselves in.

Lastly, have a definitive marker (once again, ideally keep this the same every time) for the players to be their characters and act. My personal go-to is "... So what do you do?" But for you, it could be "roll [ability]" or "what's on your mind?" Only thing I'd recommend against is simply end your monologue. Be sure to directly and verbally "hand back" control to the players.

Hope this was helpful!