There are carbon fiber frame repair shops that can replace the cracked sleeve. One of the most respected (and expensive) is https://calfeedesign.com/repair/ . Get an estimate from them for comparison and search some other repair shops. I don't know enough about any other shops to recommend one but you may be able to find reviews to determine if you want to go with someone other than Calfee. Out of curiosity what is the brand, year and model of your frame?