Let me use the analogy of human high jumping. Although the height that human high jumpers have achieved has risen dramatically in recent decades (now over 8 feet), there is a limit (a physical limit to how high a human can jump). So possibilities of yet higher jumps remain. But the book is not wide open on these possibilities, as long as we’re talking about human physiology. You won’t see anyone ever high jumping 50 feet! But maybe someone will someday achieve a jump of 9-10 feet. The same thinking applies to the limits and possibilities of scientific knowledge. Yes, scientific knowledge is not a completed story. Yes, more remains to be told (discovered). But what remains, when it is disclosed, will come under the category of nature as we now know it. There is no reason for claiming that among those possibilities not yet disclosed are supernatural realities (the sort you yearn for). That would be like claiming that because human high jumpers are still setting new records, one will eventually jump over a 100 foot barrier unaided!
With the issue of the existence or not of a deity, the burden of proof falls on the theist, not on the skeptic.