Can I Begin Again, Brothers/Sisters?

Assalamualaikum wa rahmatullahi wa barakatuhu. Alhamdulillah wassalatu wassalamu ala Rasulillah. I need to be honest - I messed up a lot in the past. About six months ago something big happened in my life and for a while after that I felt different. When I sinned I would feel real regret, cry, and ask ALLAH SWT for forgiveness. Reading verses and hadiths about His mercy used to revive me. Thinking of the favours ALLAH SWT showed me - like how He saved me from disbelief when I was surrounded by atheists and doubts at school - made me realize even small slips were huge blessings to be careful about. I remember watching a daee on TV once and my imaan was restored; I could answer those who doubted and one even admitted Islam made sense - ALHAMDULILLAH. That’s one of the favours I still thank Him for. But lately I feel empty. Things aren’t the same. I neglected fard salah recently - I stopped out of negligence while I was involved in another major sin. I’ve been around people who smoke, drink, and have haram relationships, and I was shocked by how the dunya looks now. Before I used to pray sunnahs, sometimes tahajjud, read Qur’an daily, and watch beneficial Islamic content. Now I don’t do much of that and I don’t feel connected to ALLAH SWT like I used to. When I sinned before, repentance would keep me alive inside; now repentance doesn’t feel the same. Maybe I was ungrateful during that earlier change, or maybe that change was a test and I failed. I lost something very close to me six months ago and I can’t explain it well, but it affected me deeply. Most of my religious learning and practice has been done alone - I never had someone to discuss struggles or share religious talks with. I’m not sure if I didn’t find the right person, or if later-developed autism made social things harder. Online I’m fine typing, but face-to-face I freeze. Today I tried to restart: Qur’an, sunnah prayers, all the things I left. But I still feel empty. I’ll try to keep going - please make dua for me. I’m sorry this is long and messy. I’m broken and worried I didn’t explain well. Thank you for reading. Please give sincere advice. Barakallahu feek.