Welcome to the Community!
Sorry to hear you're having trouble with the Play Store.
It sounds like an issue with the Play Store app itself. I've done a bit of research and it seems the following options have worked for others in a similar situation:-
Let me know how it goes!
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Thank You very much
This enables me to install one app at a time, ghen I have to repeat to install another app very frustration
I'm really sorry about this, I can understand it must be frustrating.
I wish there was more I can do but it seems to be an issue with actual Play Store so there isn't much I can do.
Let me know if there's anything else I can help you out with.
All the best!