There are only a few things you can do in this situation:
Reset the BIOS: Some laptops (keep in mind, not all laptops) let you reset the BIOS settings, which may include the password. Usually this means removing the CMOS battery from for a few minutes (keep in mind this also completely clears your RAM and Flash Memory).
Using a Master Password: Acer most likely has a master password to reset the BIOS password. You'll probably need Acer support to give it to you and you'll need a laptop serial number.
BIOS Recovery Tools: My only advice on this is to proceed with caution, as most of the tools do more harm than good.
Professional Help: I have a festering hate of manufacture "technicians", so if you go this route prepare for your device to be wiped without notice.
DON'T Reimage the Laptop: You mentioned being willing to do this, but this will not reset the BIOS password. Instead, you will just cause unnecessary data loss.
Another method I don't recommend (but that could work) is brute-forcing the password with a flipper zero or something like that. The reason I don't recommend this is because it could fry your motherboard.