Sounds like a dirty carb. Gas after about 5 to 6 weeks starts to turn to a varnish in the carb clogging the fuel ports thus creating fuel starvation and bogging down at throttle take the carb apart and thoroughly clean and or soak in a good carburetor cleaner.
Have you tried replacing the spark plug and the air filter. After storage they most likely need replacing or at least cleaned. You might try a little sand paper on the plug and check the gap to make sure it's set right.
When you get it running check to see if you have a good flow out of the exhaust, had a number of units this year like this that mud dobber bees had pluged up the exhaust trying to build a nest in them.
You might take a look at the spark arrestor.
The 2-cycle exhaust tends to partially plug things up causing back pressure.
Costs nothing to have a look.
Rich