I am not aware of any built in or simple plug and play macros/programs that will do this kind of analysis of baseball statistics.
Is this an Excel specific question, or is this a broader statistics/prediction/extrapolation question? We are usually pretty good at Excel questions, but I don't know if any of us has the statistical expertise to recommend or develop a statistical algorithm from scratch for this. If you help us understand the algorithm you want to use, we should be able to help you program that algorithm into Excel.
I tried an internet search and found a couple of interesting hits (if this is more about statistics than Excel):
http://cs229.stanford.edu/proj2019au...w/26382632.pdf This looks like a student project?? for a class at Stanford where they tried multiple different methods to predict a player's OPS+ metric (whatever that is). The page summarizes their results, which appear to be marginal at best.
https://solomonkurz.netlify.app/post...an-do-for-you/ This is a fairly extensive discussion focused on predicting batting average at the end of the season based on early season data. Seems somewhat successful, but I'm not sure how one would adapt the algorithms presented for other metrics or for year over year metrics. It looks like code is provided, I think for R rather than Excel (not surprising since, according to my statistician colleague, serious statisticians tend to shy away from Excel).
It sounds like an intriguing project. I expect it will get fairly involved, as the statistics probably gets fairly deep for a project like this. We can probably be most helpful if you choose an algorithm that you want to use, program what you can into the spreadsheet, then pose specific questions about the parts of the algorithm that you have difficulty implementing on your own.
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