Salaam,
When visiting the Massjid, you can request from the Imam to have a conversation whereby you explain this matter to him. Maybe he knows other reverts in similar situations whom can be introduced to you. Most likely they are probably as lonely and supporting each other may be a good idea (not only for Eid celebrations, but general companionship- support for similar struggles etc.).
A good place to find other reverts would be to join Islamic classes designed for New Muslims. (Usually, offered at a local Islamic community center or Massjid)
Be careful online when joining groups on Facebook for New Muslims; sometimes they are unmoderated and there is the possibility of misguidance.
Provided your family isn't very aggressive (to you) maybe include them on Eid day, sending food or desserts? Or invite them to share in your Eid meal. Depending on their level of hostility you may or may not chose to raise Islamic topics but preferably start by re-building caring familial bonds and keeping the topic on safe areas. There are cases whereby it is better to allow others to approach you with certain topics. Also, it can create a wonderful opportunity to show how Islam has impacted upon your life. (as the sister above pointed out)
Family can overtime change their views or stances. Especially, if they are goodhearted people.
-***However, this is all based on the level of hostility because if they are truly not good people the result could be more negative (worse case-being hurt physically) and of course better to avoid them to guard your well-being.
Have a read:
A change of heart and unrelenting hatred - An open invitation
The public invitation to Islam started in Makka after the fourth year of Prophethood. The Prophet Muhammad’s first and most important addressees were the Quraysh. Placing their idols in and around the Ka’ba, the Quraysh had managed both the major and minor pilgrimages (hajj and
‘umra) since the time of Abraham and Ishmael, and for this reason held a position of privilege and esteem among the other tribes. They erected the idols of various tribes both inside and around the Ka’ba in order take full advantage of the visiting pilgrims. Difficult days awaited the Prophet who continued to invite members of his family and his close friends to Islam. This was because he was now instructed to openly convey the truths revealed to him to the Makkan polytheists (Al-Hijr, 15:94) and commanded to warn all those he could reach, starting with those closest to him. (Ash-Shu’ara 26:214).
The Prophet began this arduous struggle, which was to continue for close to twenty years until the conquest of Makka, with a feast to which he invited his closest relatives. About forty-five people, members of the Banu Hashim and Banu al-Muttalib clans of the Quraysh tribe, attended this banquet. However, after the meal, the Prophet’s uncle Abu Lahab took the floor and, not giving the Prophet a chance to speak, said: “I have never seen a person bring as bad a thing to his tribe as you have brought.” Upon this, all the guests left. Greatly saddened by this adverse outcome the Prophet organized another meeting a few days later. Explaining to his invitees that God was one, that He had no partner or equal, that he himself believed and trusted in Him and that he would not lie to his guests, the Prophet continued his words by saying: “I have been sent as a Messenger to you, in particular, and to all humanity, in general. I swear by God you will die just as you fall asleep, you will be resurrected just as you wake from sleep. You will be called to account for your deeds. You will receive reward in response for your goodness and punishment in response to your evil. Both Paradise and the Fire are eternal. You are the first I have warned.” The Prophet’s uncle Abu Talib declared that he was impressed by the Prophet’s words and that he would support him, but that he would not abandon the religion of his forefathers. His other uncle Abu Lahab told his relatives to prevent the Prophet, that they would be humiliated if they accepted his invitation and that they would be killed if they protected him.
Upon hearing this Abu Talib declared that he would protect his nephew so long as he lived. Abu Lahab and his wife were in constant opposition to the Prophet, showed bitter enmity towards him, and in particular followed him when he met with people who came from outside Makka only to contradict him, announce him a liar and sorcerer and claim that he had caused dissension within his tribe. It is for this reason that a Qur’anic chapter bearing Abu Lahab’s name was revealed, stating that both he and his wife were doomed to perish in the Fire. (Al-Masad, 111:1-5). Despite the fact that the Qur’an contains explicit statements of the words, actions and even intentions of those who showed hostility to the Prophet and the Muslims, none of their names, with the exception of Abu Lahab, have been mentioned.