Try adding modrinth publishing

fabric/build.gradle

@@ -1,6 +1,6 @@
 plugins {
 	id "com.github.johnrengelman.shadow" version "7.0.0"
-	id "com.matthewprenger.cursegradle" version "1.4.0"
+	id "me.shedaniel.unified-publishing" version "0.1.+" apply false
 }
 
 def ENV = System.getenv()
@@ -82,24 +82,50 @@ components.java {
 	}
 }
 
-if (ENV.CURSEFORGE_KEY) {
-	curseforge {
-		apiKey = ENV.CURSEFORGE_KEY
-		project {
-			id = project.curseforge_id_fabric
-			releaseType = project.curseforge_type
-			addGameVersion "Fabric"
-			addGameVersion "1.16.4"
-			addGameVersion "1.16.5"
-			mainArtifact(remapJar.archivePath)
-			relations {
-				requiredDependency 'rhizo'
-				requiredDependency 'architectury-api'
-				requiredDependency 'fabric-api'
-				optionalDependency 'probejs-legacy'
+unifiedPublishing {
+	project {
+		releaseType = project.artifact_type
+		gameVersions = [
+			"1.16.4",
+			"1.16.5"
+		]
+		gameLoaders = ["fabric", "quilt"]
+		displayName = "$project.mod_name Fabric $project.version"
+		// changelog = getGitChangelog()
+		mainPublication remapJar
+
+		relations {
+			depends {
+				curseforge = modrinth = "architectury-api"
+			}
+			depends {
+				curseforge = modrinth = "fabric-api"
+			}
+			depends {
+				curseforge = "rhizo"
+			}
+
+			optional {
+				curseforge = modrinth = "roughly-enough-items"
+			}
+			optional {
+				curseforge = "probejs-legacy"
+			}
+		}
+
+		if (ENV.CURSEFORGE_KEY) {
+			curseforge {
+				token = ENV.CURSEFORGE_KEY
+				id = project.curseforge_id
+			}
+		}
+
+		if (ENV.MODRINTH_TOKEN) {
+			modrinth {
+				token = ENV.MODRINTH_TOKEN
+				id = project.modrinth_id
+				version = "$project.version+$project.name"
 			}
-			// changelog = getGitChangelog
-			// changelogType = 'markdown'
 		}
 	}
 }

forge/build.gradle

@@ -1,6 +1,6 @@
 plugins {
 	id "com.github.johnrengelman.shadow" version "7.0.0"
-	id "com.matthewprenger.cursegradle" version "1.4.0"
+	id "me.shedaniel.unified-publishing" version "0.1.+" apply false
 }
 
 def ENV = System.getenv()
@@ -129,25 +129,47 @@ components.java {
 	}
 }
 
-if (ENV.CURSEFORGE_KEY) {
-	curseforge {
-		apiKey = ENV.CURSEFORGE_KEY
-		project {
-			id = project.curseforge_id_forge
-			releaseType = project.curseforge_type
-			addGameVersion "Forge"
-			addGameVersion "1.16.4"
-			addGameVersion "1.16.5"
-			mainArtifact(remapJar.archivePath)
-			relations {
-				requiredDependency 'rhizo'
-				requiredDependency 'architectury-api'
-				optionalDependency 'jei'
-				optionalDependency 'game-stages'
-				optionalDependency 'probejs-legacy'
+unifiedPublishing {
+	project {
+		releaseType = project.artifact_type
+		gameVersions = [
+			"1.16.4",
+			"1.16.5"
+		]
+		gameLoaders = ["forge"]
+		displayName = "$project.mod_name Forge $project.version"
+		// changelog = getGitChangelog()
+		mainPublication remapJar
+
+		relations {
+			depends {
+				curseforge = modrinth = "architectury-api"
+			}
+			depends {
+				curseforge = "rhizo"
+			}
+
+			optional {
+				curseforge = modrinth = "jei"
+			}
+			optional {
+				curseforge = "probejs-legacy"
+			}
+		}
+
+		if (ENV.CURSEFORGE_KEY) {
+			curseforge {
+				token = ENV.CURSEFORGE_KEY
+				id = project.curseforge_id
+			}
+		}
+
+		if (ENV.MODRINTH_TOKEN) {
+			modrinth {
+				token = ENV.MODRINTH_TOKEN
+				id = project.modrinth_id
+				version = "$project.version+$project.name"
 			}
-			// changelog = getGitChangelog
-			// changelogType = 'markdown'
 		}
 	}
 }

gradle.properties

@@ -4,13 +4,14 @@ org.gradle.caching=true
 
 mod_id=kubejs
 archives_base_name=kubejs
+mod_name=KesseractJS
 mod_version=1605.3.20
 maven_group=dev.latvian.mods
 mod_author=LatvianModder
 
-curseforge_id_forge=1025372
-curseforge_id_fabric=1025372
-curseforge_type=release
+curseforge_id=1025372
+modrinth_id=9s7vCvdT
+artifact_type=release
 
 minecraft_version=1.16.5
 rhizo_version_forge=5506575