This script adds likes to one page from all of the other pages from your account, run it in the browser's console in Ads Manager

LikeYourPageWithOtherPages.js

const GRAPH_API_URL = "https://graph.facebook.com/v18.0";

class FacebookManager {
  constructor() {
    this.adsManagerToken = __accessToken;
    this.defaultFetchOptions = {
      mode: "cors",
      method: "GET",
      credentials: "include",
      redirect: "follow",
    };
  }

  async fetchFromAPI(endpoint, options = {}, addDefaultOptions = true) {
    const requestOptions = addDefaultOptions
      ? { ...this.defaultFetchOptions, ...options }
      : { ...options };

    const response = await fetch(
      `${GRAPH_API_URL}/${endpoint}`,
      requestOptions,
    );
    return await response.json();
  }

  async privateApiRequest(
    variables,
    docId,
    url = null,
    suppressEvaluation = true,
  ) {
    if (url == null) url = "/api/graphql";

    return new Promise(async (resolve, reject) => {
      try {
        let req = new AsyncRequest()
          .setOption("suppressEvaluation", suppressEvaluation)
          .setOption("asynchronous_DEPRECATED", !0)
          .setOption("retries", 10)
          .setAllowCrossOrigin(!0)
          .setAllowCrossPageTransition(!0)
          .setURI(url)
          .setMethod("POST")
          .setData({ doc_id: docId, variables: JSON.stringify(variables) })
          .setHandler((e) => {
            resolve(JSON.parse(e.payload.responseText));
          });

        req.send();
      } catch (error) {
        reject(error);
      }
    });
  }

  async likePage(sourcePageId, targetPageId) {
    let uid = require("CurrentUserInitialData").USER_ID;
    return await this.privateApiRequest(
      {
        input: {
          source_page_id: sourcePageId,
          targe_page_id: targetPageId,
          actor_id: uid,
          client_mutation_id: "1",
        },
        targetPageId: targetPageId,
        isAdminView: false,
      },
      "6845219162200157",
    );
  }

  async getPages() {
    const data = await this.fetchFromAPI(
      `me/accounts?access_token=${this.adsManagerToken}`,
    );

    if (data.data.length === 0) {
      throw new Error("No pages accessible with this token!");
    }

    let selectedPageId = 0;
    let useManual = confirm("Do you want to enter page id manually?");
    if (useManual) {
      selectedPageId = prompt("Enter page id to like:");
    } else {
      const pageNames = data.data.map((page) => page.name);
      const pageIndex =
        parseInt(
          prompt(
            `Page Liker by Yellow Web\nSelect a target page by entering its number:\n${pageNames
              .map((name, idx) => `${idx + 1}. ${name}`)
              .join("\n")}`,
          ),
          10,
        ) - 1;

      if (pageIndex < 0 || pageIndex >= data.data.length) {
        throw new Error("Invalid page selection.");
      }

      selectedPageId = data.data[pageIndex].id;
    }

    return {
      targetId: selectedPageId,
      pagesIds: data.data.map((page) => page.id),
    };
  }
}

async function main() {
  try {
    const manager = new FacebookManager();
    let res = await manager.getPages();
    for (let index = 0; index < res.pagesIds.length; index++) {
      const curPageId = res.pagesIds[index];
      if (curPageId == res.targetId) continue;
      console.log(await manager.likePage(curPageId, res.targetId));
      console.log(`Liked ${res.targetId} from ${curPageId}`);
    }
    alert("All Done!");
  } catch (error) {
    console.error("Error:", error.message);
  }
}

await main();