For future reference, you can buy individual replacement cogs for the 11 speed Shimano cassette and many other cassette. The cogs that wear out the quickest are the smallest ones, the high speed first two cogs, 11 tooth and 13 tooth. They have the fewest cogs engaged on the chain which are therefor exposed to the most wear. A pair of 11 & 13 tooth cogs can be purchased for about $20 on Ebay. I was able to do this twice, tripling the life of my cassette. Note the long dropout along with the long cage. This is on a 2018 Riese & Muller Delite Mountain.
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https://www.ebay.com/sch/i.html?_fr...esc=0&_osacat=0&_odkw=shimano+xt+11+tooth+cog
I also changed over to the Sunrace 11-46 cassette as it has more evenly distributed gear steps and seems to shift more quickly and precisely.
https://ebay.us/zbCNro That is very true about the smallest ones wearing out first.