Just stick to a trading system that works for you, you already master it and already giving you good profits.
For example, if it supports and resistances, then go for it, that's fine. Even it is common but it is giving you good profits, then take it, continue to improve it and learn more.
This is the fact. A lot of newbies to trading concern themselves with a lot of details; they want to master any strategy they come across in trading, they watch every tutorial and listen to everyone, concerning themselves with a lot of noise when they should rather just pick a strategy and focus on developing and knowing more about it. Every strategy works; it just depends on your depth of knowledge about it and your psychology.