I can't get my watch from not fogging.

First of all, find a more honest watchmaker. But also have realistic expectations. You will probably need a new crown, and even then the watch may not be totally watertight.

Go to a competent watchmaker

That crown is definitely not original to the watch and I suspect that it's part of the problem. Unfortunately, the original crown is no longer available, but a competent watchmaker should be able to find a suitable replacement that works. The seals need to be replaced and the crystal may need to be replaced as well. Then the watch needs to be pressure tested. If it passes, that should cure the fogging issue. I'll PM you with some suggestions for watchmakers.

Looks like a nice example. It’s worth spending a bit of money to get it serviced and more resistant to moisture

If you want to learn watchmaking practice on working complete fully functional and accurate timed movements such as those from the DIY watch club. Like the NH35 or comparable ETA movement.

Working with old trashed movements often leads to frustration. Although such can be rewarding when it starts to work. Not all that cost effective. Such are useful for learning how to remove replace screws. And what order to disassemble things. How to find parts what fly across the room.

If the watch is not keeping time to start, it is hard to learn where the faults are. Starting with something working, and experimenting with adding faults, correcting the known fault, helps to learn what to look for. Otherwise it is easy to correct the wrong fault and make things worse.

If possible learn from a person in house. Books and you tube videos are more for entertainment or refresher info. How to sit, the height of the workspace, how to hold posture for hours on the end without fatigue, really needs a mentor to show what one is incorrect, and how to correct these movements.

Supposedly the world is loosing 1000 watchmakers a year. So there are plenty of opportunities to learn. If one is in the US or UK , there is the AWI and BHI which have courses.

Many though are looking for younger people to train, who do not have preconceptions. Ideally someone who can work for 30 years or so. Traditionally the industry was built on low wage semi skilled labor, what was trained using efficiency methods to maximize throughput.

In this era with laser cutting, 3D printing and accessible design software, there are some interesting ways of replicating parts/fixtures.

Other than the wrong crown, that is a VERY nice example of a cursive Geneve. Both the dial and the case look almost untouched and that is rare. They aren't easy to find in this condition and a good watchmaker should be able to put it into excellent working condition. If you're interested in becoming a serious collector of vintage Omega, this watch is a good starting point. I have one myself.