exceeded amount of workouts

You can link workouts to calendar and then you can then load more workouts and find them in training calendar

I am not sure what you mean " form paste".

I would delete them from the watch itself and keep them on Connect so that you can send to device every now and again when you want the different workouts on the watch.

Can you describe in detail what and where you deleted? I logged into garmin connect - workouts - deleted everything that was there (there were only workouts created by me) and nothing changed..

Sorry for my English

You need to delete them on the watch . You can keep them on connect and just send to device when you need them or add them to the calendar 

To delete it from the watch the only way I know is to go to an activity like run then uninhabited the up button select training > workouts , select a workout then using the start button and select delete .

I do not know how to bulk delete , other than by connecting to computer and deleting the individual workouts from the device drive folder . If you use a Mac you need to use android file manager. 

The watch has gigabytes of storage but still there's like XX amount of workouts and courses that the watch can have.

https://support.garmin.com/en-US/?faq=aEyhNQKOCFAytMFnCvdAM7 

That's hilarious in some kind of weird, twisted way.

Like having a speedlimiter in a supercar and set it to 30kph. 

Yes. I kind of understand that some limit is good, but how low is it set is somewhat weird. Why not like at least 100.