Is there repentance for a servant regretful of committing major sins such as bestiality, watching images of boys [engaged in sexual acts] along with shirk (associating partners with Allah), and saying to them: "You are Allah," and what follows from that of great calamity and a feeling of disbelief and misguidance?

Indeed, the statement "You are Allah" and other misguided ideas expressed by the questioner without concern are clear deviations that make one's skin crawl. The steps of Satan begin with minor sins, then major ones, until they lead a person to major disbelief (kufr akbar). However, Allah's mercy encompasses all things; He has decreed mercy upon Himself and accepts repentance from those who have done wrong out of ignorance or wronged themselves. Therefore, the questioner must offer sincere repentance, regretting their sins, abandoning them, and resolving not to return to them. If they remain steadfast in their repentance and replace their evil deeds with good ones, then Allah will accept them and have mercy on them. The questioner is also advised to hasten to marry, and if they cannot, then they should fast.