Many regionals give a written test based on the ATP question bank. If you expect to go the regional route, take the ATP now if you have time do do it.
It will still be valid even beyond two years if you are at a 121 operation. What you do NOT want to do is be in your upgrade class at the airline and have to deal with the ATP written at the same time...

The FE written is pointless unless today you have some employment prospect at a cargo operation...if you find yourself in that situation, take the FE then.