The chart on the right represents 30 year treasury bonds. The chart on the left is TLT, an ETF that expresses a trade in treasury bonds.
The way to profit most is probably via call options on TLT. I am looking at the 172 strike in August.
The other way is to be long futures. I am long ZB1! futures contract. The negative is the minimum size is $181,000. So for most retail traders, call options on TLT is the best way to play the long here. Owning TLT outright eats a lot of capital for low return.
Here is the long term chart of 30 year treasuries:
Other ways to play this: 5 year treasuries ZF1! (125k contract but much less volatile) 10 year treasuries ZN1! (140k contract with more vol than the 5 year but about 1/4th the vol of the 30 year.