I would find it good if some members of upvu also published high-quality exclusive content in a community. Maybe you would also like it and support it and advertise it a bit. I have founded a community where such contributions could be posted. https://steemit.com/trending/hive-106812

I am the founder of a social non-profit organisation. Is there any possibility that you could do some publicity for them, that they are supported by voting ?

Cheers for this.
However, it is still difficult to provide support due to the upvu structure.

I have not received a daily payment in Steem for several days since I changed my delegation. Are there any problems here? Will the sum be paid accordingly?

Steem reward starts after 7days since delegation.
You re-delegated SP 2022-04-09.
So you need to wait 3 days.

Thanks.