If i could not use any indicators moving averages patterns or other things and was allowed one thing to trade it would be trendlines.
The most popular bitcoin posters all seem to constantly have charts with multiple indicators, patterns, elliot wave, fibonacci.
These give them the ability to play both ways and they scream about being right.
My only advice to anyone is DO YOUR OWN CHARTS.
MAKE YOUR OWN TRADES
If you lose money its you, if you make money its you, no one inherently is better at TA than you, learn yourself give yourself confidence and take ownership of your mistakes and successes.