The party nomination isn’t official until the delegates vote at the convention. That isn’t new. The nomination is never final until the convention.
The people voted in the state party primary. Biden and Harris were the incumbents on the Democratic party ticket. Joe Biden dropped out of the race and endorsed Vice President Harris as his replacement. If the party does not largely agree that Harris should be the new nominee, they will have an opportunity to vote for someone else at the convention.
For me this doesn’t change anything. My vote was always going to be for the Democrat. Not because I love Democrats. I really don’t. But because any other vote is basically a vote for the moron in the stupid hat, and I really don’t want that.
Here are a few suggestions:
Volunteer at a soup kitchen or a food pantry
Sign up for a church email newsletter and go there when they are doing pot-luck meals (bring a dish to pass)
If you are into sports, sign up to volunteer as a coach.
Don’t buy all of your groceries all at one time. Buy a few things each time and go more often. Even if you don’t meet or talk to anyone but the workers, you will be around other people.