I know dealers tend to say doses are higher then they actually are, and 280ug sounds ridiculously high. How likely it is it’s actually 280ug?

The issue is all my psychodelic experiences were a disappointment (never felt effects other then a bit of euphoria and nice colors) and I want to finally trip properly, but I think 280ug would be way too much for me to handle given I haven’t really tripped before. So on one hand I don’t want to overdo it, but on the other hand I really want to experience a proper trip. Any advice?

I did research on the substance, given I’ve tried it before but it failed (I was on SNRI back then), but I want to hear from other’s experience and can’t find much info on this specific topic on the sub.