i'm not sure that the loss is only due to an improper trading platform, because in trading a TA is part of the other main factors that make a loss from trading, because even though we trade on an inappropriate trading platform but the TA we do is very good then i'm sure it will still make a profit
Technical Analysis is not that much important when someone is very strong in fundamentals,so OP didn't have hope on his coins that is why he lost his capital and unfortunately he has only dust which can't be traded on any exchange platforms.
ta wont be invented and wont now be popular if its not important . you said he dont have a hope on his coins , that also his mistake . to have faith on what we have is a must so that we can believe on it and dont do early moves that leads to our losses . chosing an exchange is also important because of the security and the volumes they have . it wont be useless if you lack all these important factors because you cant still be sucesful on your trades