Dont give up. My suggestion is to get a few ppl as Map Testers. Dont release anything before you and the crew say its ready.
I had a few myself, and they helped me alot.
If level design is something you really enjoy I would not let the negativity of others stop you. I would read as many good tutorials as I could. I would play maps that I really enjoy and then study them in the editor to figure out what makes them work. And as another suggested, get people to test the map before release. I do not consider myself a great level designer, but I enjoy it, and I have stuck with it. And today I use UE4 and 5 in my actual job. But in the beginning all I ever heard was the rude and negative thoughts from arrogant people.
Just ask here if someone has some time to spare to help you.
Like others said, ask here. Sometimes I make a private group on discord, or feel free to pm me and I will beta for you also. There are always going to be those who are willing.