Sewing Machine Won't Pick Up Bobbin Thread?

Sadly, you can't fix this at home - the timing is off and getting a sewing machine of any make/model properly retimed is a job best left to the qualified repair tech.

I do repair and refurb here in Scotland for my Sewing 101 students - many bring in a vintage sewing machine they've got from a gran or a jumble sale and those machines haven't seen a servicing in decades - checking the timing is part of the servicing I do on these machines. If/when a student brings the machine I've already done a retiming on and tells me the timing is off again, it's time for me to talk with the student regarding good habits that keep a sewing machine in good timing.

Your repair tech needs to work with you to discover why your machine needs frequent retiming - something as simple as turning the hand wheel the wrong direction (most machine hand wheels should be turned towards you and NEVER away) to using the wrong type bobbin (metal where plastic is required).

Re the bobbin - a lot of modern machines now use a magnetic timing system and using metal bobbins (even if they fit fine and you manage one or two sewing sessions with it in) interferes with the magnetics.

Talk to your repair tech and find out what you're doing to throw off the machine timing:)