Probably not. If both AF and MF stopped working after a drop, the damage is likely internal and could involve the focus mechanism, motors, guides, electronics, or ribbon cables. Modern lenses are densely packed and complex, and impact damage often affects multiple parts at once.

When a repair shop calls a lens a write-off without even quoting repair, that usually means one of two things: the damage is severe enough that successful repair is unlikely, or the parts and labor would exceed the lens’s practical value. Some damaged components may also be non-serviceable.

DIY repair is generally unrealistic unless you already have lens repair experience, proper tools, and access to parts/service information. Opening it further risks causing more damage, especially around flex cables and alignment-critical optical groups.

Most practical options are:

• seek a second opinion from a specialist lens repair service,
• sell it as damaged/for parts,
• or replace it.

If it still produces acceptable images at a fixed focus distance, you could test that, but restoring normal focusing yourself is very unlikely.