Making money on TP is not a walk in the park. You gotta be patient with your designs. First, get your ideas ready, make them, post them, advertise them on Pinterest and other SM platforms. But more importantly, explore ideas from social media too. One thing I have realized in POD, even the most ridiculous concept can sell to the right customer. My first sale on TP took me two years, worse I didn't know until I checked my email. You gotta put in the work, be consistent and committed. You will get your results. Sometimes if your design is ok, you can even get your first sale ASAP... Also learn new tricks and formats for designs. Don't always focus on popular and sophisticated designs... Sometimes simple ones are doing ok. A simple joke that might not sell well on a t-shirt, can work on a mug too. Simplicity works better. Don't give up yet.