Help me! My bestie’s the dm but she relies on me to get everyone together. When I text on the chat no one responds. Any tips?

You can't make people be committed or punctual, that's something they will decide themselves. If no one is responding, they clearly don't prioritise the game to and degree you do. You might need to find a different group 

The best thing you can do for scheduling is consistency. Set a standing time to play - “every Thursday at 18:15” “every other Saturday at 12:30” - and then do your best to stick to that schedule. You can deviate sometimes - maybe move the session to a different time or day if there is a need, but that should be the exception and not the rule. This ensures consistency in scheduling and gives folks a set time they can predict when setting other elements of their schedule.

Then be willing to say “we are going to play without you.”  Even if a couple people say they cannot make it, if a mutual backup time that week doesn’t work, you should be prepared to say “I guess we will stick with regular time and whoever can be there.” That does two things for you - it means you will be able to play even without coordinating all schedules perfectly and people tend to be a bit better about keeping the set date and time open if they realize they will miss out. 

Quote from Duskforme_Lycanrock >>

Help me! My bestie’s the dm but she relies on me to get everyone together. When I text on the chat no one responds. Any tips?

 Welcome to real life. That’s why campaigns don’t go on for long time. If these are not real life friends, maybe find a new group. With people who are committed to playing 

Thank you all so much. 

I've got to say, the regular schedule thing is really important.

If you say, "When can we meet this week?", people will come back to you with their schedules and expect you to work around them. With up to seven people doing that...it becomes nigh on impossible. Especially since they'll include items of arbitrary importance like "But Monday evening is when I do my online grocery order so it can be delivered on Thursday", whether they dress it like that or not.

Get them together, ideally in person or if you have to in a Discord call or whatever - it must be a live conversation with actual voices. Then hash out an evening. People soon realise that the unreasonable demands are unreasonable (like, doing your online grocery order can be done any day of the week so Mondays can work, because Bob ain't going to shift his work schedule from your ideal of a Wednesday evening, so everyone will find a way) and you can almost always work something out. You'll get your schedule sorted.

Then insist on that schedule. If it's a Monday evening, insist it's a Monday evening. When you start trying to juggle things around...it removes the importance of keeping the schedule...and people will start assuming that if they feel like doing their grocery order that evening, then they can get you to make it happen...So stick to it.

You'll see the miracle happen that people will then start defending that spot. They get offered to play tennis? Nope, that's D&D night, can we play Wednesday instead?

Honestly, text messages and the like is horrible for scheduling because people stop compromising. They expect others to compromise, even if their own stake is negligible. Get them talking to each other by voice, preferably in person where they can read each other's body language, and everyone will become more flexible. Occasionally you'll get truly incompatible schedules, and there's not a lot you can do about that. You just have to make hard decisions. But most of the time, it's a matter of compromise (and those who need to compromise aren't always the ones you think).

Try your best to quickly suss out who are the people who like playing D&D and who are the ones who only like to talk about D&D. You will save yourself a lot of disappointment the faster you can make that determination. The latter are the people who get really excited about you organizing a game. They make characters even and agree to join, but have something come up every time. There are always going to be things a person can do instead of D&D. It is a game you have to set aside time for and some people just can't get that far or, as others have noted, don't prioritize. When that happens, any little thing that comes up immediately bumps D&D off the calendar. 

I just had a game fall apart because I was the caged critter that didn't want to accept that the food pellets are charged with electricity. (˃̣̣̥ᯅ˂̣̣̥) Oh well.