Generally take about a month off to get your body refreshed from stimulant tolerance.
Instead of fat burners, you could try a testbooster/Anti estrogen and focus on your workouts and diet. Also could look into something like which is known for it's recomp effects.
There are tons of PreWOs on nutraplanet, and most of them will work well. Live life a little and take a pick of one that looks interesting to you. Find ingredients that think work well for you.