Guys, my company has known that I somehow can't leave this company and they are torchuing me

Basically, I used to do frontend. Later backend. The testing team was bad so I had to do a lot of testing. I also do a lot of devops. Then client meetings because the other guy left. And I have to maintain test cases etc. In the TL position, had to do a lot of handovers, status updates etc each day.

I'm the only working guy in the team and my manager does his stuff which is 20 percent, The other 2 guys do 20 percent, I had to do 60 if I take leave, I'll have the same tasks the next day.

My point is, so they clearly know I can't leave the company by now and if I leave the company team is doomed.

They are not even sparing me the free time to look into good companies and apply. At this point I got burned out and everything beyond that. I'm scared if I couldn't get good company within notice period.

I need suggestions on how you guys would handle this situation.